CN1526747A - Environment responding aquogel copolymer and its prepn - Google Patents
Environment responding aquogel copolymer and its prepn Download PDFInfo
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- CN1526747A CN1526747A CNA03144329XA CN03144329A CN1526747A CN 1526747 A CN1526747 A CN 1526747A CN A03144329X A CNA03144329X A CN A03144329XA CN 03144329 A CN03144329 A CN 03144329A CN 1526747 A CN1526747 A CN 1526747A
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Abstract
The present invention relates to one kind of environment responding aquogel copolymer and its preparation process. The aquogel consists of: N-isopropyl acrylamide 10-90 wt% and methacrylate dextran derivative 10-90 wt%. The preparation process of the environment responding aquogel copolymer includes chemical modification of dextran with GMA to synthesize methacrylate dextran derivative, MA-Dex, with reaction activity; and subsequent copolymerization of MA-Dex and NIPA to obtain the said environment responding aquogel copolymer P(NIPA-co-MA-Dex). The aquogel copolymer has high temperature sensitivity and quick responding speed as well as high strength and excellent biocompatibility. The preparation process is simple, needs no special apparatus and is easy to realize in industry.
Description
Technical field
The present invention relates to a kind of progress in Intelligent Hydrogel and preparation method thereof, be specially a kind of environmental response type N-N-isopropylacrylamide (N-isopropylacrylamide, NIPA) with methacrylic ester glucan derivative (MA-Dex) copolymer hydrogel and preparation method thereof technology, belong to functional high polymer material field, international Patent classificating number intends being Int.C1
7C08F20/54.
Background technology
Progress in Intelligent Hydrogel be a class for external environment small physics or chemical stimulation, the hydrogel of considerable change can take place in himself character.It is the cross-linked hydrophilic polymer network, and is water insoluble, but can be in water swelling.The typical external environment of having studied stimulates temperature, pH value, electric field, ionic strength, solvent, reactant, light and chemical substance etc.Because progress in Intelligent Hydrogel has the water content height, advantages such as good biocompatibility, thereby in biotechnology, system is put in control as medicine, aspects such as contact camera lens, wound dressing material and bio-pharmaceuticals are researched and developed widely and used.
In numerous progress in Intelligent Hydrogel, temperature sensitive poly N-isopropyl acrylamide (PNIPA) hydrogel research at present is the most extensive.The PNIPA hydrogel has good temperature sensitive characteristic, and lower critical solution temperature (LCST) is about 32 ℃.More than the temperature, the swollen hydrogel can shrink in dehydration at this; And under this temperature, hydrogel is water absorption and swelling once again then.But the PNIPA hydrogel also exists shortcoming: too soft under solvent swelling state, be difficult to typing; The volume change of gel is relatively slow simultaneously.Obviously, this will make its application be restricted.Therefore, strengthening its physical strength, improve its responsiveness (speed), will be an important topic that urgency is to be solved.
Research finds that also the copolymer hydrogel that NIPA and some monomer form also has the same characteristic of PNIPA (but the LCST value may change).With the material of the synthetic copolymer hydrogel of NIPA following a few class can be arranged:
1. non-ionic monomer.For example use acrylamide monomers and NIPA copolymerization to synthesize temperature sensitive hydrogel.The acrylamide monomers possess hydrophilic property, its adding can improve the hydrophilic/hydrophobic ratio of whole gel network, the hydrogen bond number that itself and water molecules are formed increases, need more energy could destroy these hydrogen bonds, so can improve the LCST of hydrogel by the content that changes acrylamide monomers.But the general response speed of this gellike is slower, and the response speed that improves them need be introduced new technology (as adding perforating agent or making microballoon), so process complexity, practicality is low (referring to document 1 " the N-N-isopropylacrylamide-N hydroxymethyl acrylamide gel of oxidation reduction process synthesis temperature response " (" Synthesis ofthermoresponsive N-isopropylacrylamide-N-hydroxymethl acrylamidehydrogels by redox polymerization "), B Yldz, B Isk, M.Ks. polymkeric substance (Polymer) .2001,42:2521-2529).
2. anionic monomer.For example NIPA and acrylic acid copolymer hydrogel.This hydrogel not only has temperature sensitive character, also has the character responsive to environment pH value, promptly presents contraction schedule when hydrogel is in acidic conditions following time, and is in the next solvent swelling state that presents of weak base condition.But its swelling behavior in the aqueous solution is subjected to the influence of salt ion bigger, thereby its application in some respects is restricted (referring to document 2 " a kind of preparation method who is used for the responsive gel of novel pH of intestines drug release " (" Anovel-approach for preparation of pH-sens i t ive hydrogels for entericdrug delivery '); Dong L C; Hoffman A S. sustained release magazine (J ControlledRelease) .1991,15 (2): 141-152).
3 cationic monomers.The scholar is for example arranged with NIPA and the synthetic hydrogel of N-vinyl pyrrolidone copolymerization.Find the gelation time of N-vinyl pyrrolidone energy significant prolongation copolymerization system, and compare that copolymer hydrogel has temperature-responsive preferably with the PNIPA hydrogel.But the LCST of N-vinyl pyrrolidone gel copolymer is non-adjustable.This also just limited its in practice range of application (referring to document 3 " research of N-N-isopropylacrylamide/N-vinyl pyrrolidone hydrogel ", Liu Yuyang, Fan Xiaodong, Shao Yinghui, the functional polymer journal, 2000,13:380-385).
4. ampholytic monomer.For example by NIPA and SPV (1-(3-sulphopropyl)-2-vinylpyridinium-betaine) synthetic hydrogel.Because SPV is made up of two kinds of ions of negative and positive, thereby is called the both sexes hydrogel.The swelling behavior of this both sexes hydrogel can raise when salt concn is low, and can reduce when salt concn is high, when salt concn is lower than 1mol/dm
3The time swelling ratio be higher than its swelling ratio in pure water.Though this both sexes hydrogel can overcome the influence of the introducing of the salt ion of salt ion in the aqueous solution to its swelling behavior, but this method is synthesized the monomeric process complexity of ad hoc structure, and there is not ubiquity, therefore be difficult to be applied in practice (referring to document 4 " the hot reversible swelling behavior of N-N-isopropylacrylamide and both sexes comonomer gel " (" Thermoreversible swelling behavior ofhydrogels based on N-isopropylacrylamide with zwitterioniccomonomer "), Wei Xue, Simon Champ, Malcolm B Hugling. Europe polymkeric substance magazine (European Polymer Journal), 2001,37:869-875).
As seen from the above analysis, above-mentioned four classes can all have limitation separately with the monomer of NIPA copolymerization, are not that LCST is non-adjustable, are exactly that response speed is low, have solved certain aspect problem, have influenced characteristic on the other hand again.Should be pointed out that especially above-mentioned four class monomers all belong to the chemosynthesis material, so the biocompatibility of these hydrogels is bad, non-degradable, and physical strength is general.This is very limited with regard to making its application in practice.For example, just can not get at aspects such as isolation technique that needs high strength and/or biocompatibility and new type gel machines using.
Summary of the invention
At the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined provides a kind of novel environmental response type copolymer hydrogel and preparation method thereof.This hydrogel should both have temperature sensitivity preferably, had response speed faster again, also had higher intensity and excellent biological compatibility simultaneously; Characteristics such as it is simple that the preparation method of this hydrogel has technology, do not need specific installation, and industrializing implementation is easy.
The technical scheme that the present invention solves described hydrogel technical problem is: design a kind of environmental response type copolymer hydrogel, its mass percent component is:
N-N-isopropylacrylamide 90-10%,
Methacrylic ester glucan derivative 10-90%.
The preparation method of She Ji this environmental response type copolymer hydrogel comprises the steps: simultaneously
(1) mixed solution of preparation dextran and dimethyl sulfoxide (DMSO); Add dextran and dimethyl sulfoxide (DMSO) in container, 50-80 ℃ is stirred to dextran and is dissolved in the solvent fully and is cooled to room temperature; The amount ratio of dextran consumption and dimethyl sulfoxide (DMSO) is 1g: 10ml;
(2) synthesize methyl acrylic acid esters glucan derivative; Under the nitrogen atmosphere condition, in (1) step gained mixing solutions, add catalyzer 4-Dimethylamino pyridine, treat its dissolving after, add glytidyl methacrylate, mixing solutions is through stirring, and room temperature condition reacts after 24-72 hour down, add in the hydrochloric acid again and the 4-Dimethylamino pyridine, stopped reaction; With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3-5 time, gained is the methacrylic ester glucan derivative; The mol ratio a of glucopyranose residue weight is 1 in the consumption of described glytidyl methacrylate and the dextran: 3-1: 8, the mass percent that the consumption of 4-Dimethylamino pyridine accounts for the dextran consumption is 20%, and the mol ratio b of the consumption of hydrochloric acid consumption and 4-Dimethylamino pyridine is 1;
(3) synthetic N-N-isopropylacrylamide and methacrylic ester glucan derivative gel copolymer; Above-mentioned N-N-isopropylacrylamide and methacrylic ester glucan derivative are dissolved in respectively in the deionized water by described mass ratio, add initiator ammonium persulfate or Potassium Persulphate again, the gained mixing solutions is filled N
2Gas 10-20 minute, add an amount of accelerant N, N, N` then rapidly, the N`-Tetramethyl Ethylene Diamine, pour in the mould, sealing is after room temperature reaction 8-24 hour, be cut into fritter, bubble is gone in the distilled water, changes water every day at least 1 time, promptly gets environmental response type N-N-isopropylacrylamide and methacrylic ester glucan derivative copolymer hydrogel in 4-7 days; The mass percent that total consumption of wherein said methacrylic ester glucan derivative and N-N-isopropylacrylamide accounts for solvent load is 15-50%, the mass percent that the consumption of initiator accounts for methacrylic ester glucan derivative and the total consumption of N-N-isopropylacrylamide is 1-3%, and the consumption of promotor and the mol ratio c of initiator amount are 1: 1-1: 3.
Environmental response type copolymer hydrogel of the present invention, be environmental response type N-N-isopropylacrylamide (NIPA) and methacrylic ester glucan derivative (MA-Dex) copolymer hydrogel, system adopts glytidyl methacrylate (GMA) that dextran is carried out chemical modification, synthesize glucan derivative methacrylic ester glucan derivative (methacrylate-derivatized Dextran with reactive behavior, MA-Dex), then MA-Dex and NIPA are carried out copolymerization and a kind of novel environmental response type hydrogel P (NIPA-co-MA-Dex) of obtaining.Compare with the NIPA copolymer hydrogel of aforementioned several classes, the environmental response type copolymer hydrogel that the present invention proposes has comprehensive performance: promptly temperature, pH value and ionic strength are all had susceptibility (therefore being called the environmental response type) preferably; This is because existing MA-Dex gel has susceptibility preferably to pH value and ionic strength, and rapid to temperature response; Have swelling behavior and higher physical strength and toughness preferably simultaneously, it is big because of being the MA-Dex molecular weight, thereby its long molecular chain makes whole gel network have good retractility.Hydrogel of the present invention can synthetic LCST be 33-41 ℃ as required, and promptly its LCST can regulate in the larger context, has better or wider practical application.Reported in the aforementioned documents 3 that monomer concentration is that swelling ratio in the time of 25 ℃ of the homopolymerization N-N-isopropylacrylamide hydrogel of 15wt% (swelling ratio is meant that a certain temperature is issued to when stablizing solvent swelling state hydrogel and its vacuum-drying to the mass ratio of the gel of constant weight) is about 7, and environmental response type hydrogel of the present invention is under same ambient conditions, swelling ratio can reach 20-70 even higher, also be that maximum comparable prior art improves 10 times, this product also has good integrity simultaneously, be difficult for fragmentation, show comparatively ideal mechanical property.Particularly introduced the glucan derivative of natural polymer owing in the component of environmental response type hydrogel of the present invention, thus excellent biological compatibility and biological degradability that prior art does not have had, thereby expanded Application Areas of the present invention greatly.Because described good overall characteristic, environmental response type hydrogel of the present invention can be used widely at aspects such as isolation technique that needs high strength and/or biocompatibility and new type gel machines.
The preparation method of environmental response type hydrogel of the present invention, compare with the preparation method of aforementioned a few class NIPA gel copolymers, do not use special or specialized apparatus, and in preparation method's synthetic P (NIPA-co-MA-Dex) hydrogel process, do not need to add linking agent, therefore technology is simple, is easy to industrializing implementation.
Embodiment
Further narrate the present invention below in conjunction with embodiment:
The mass percent component of environmental response type hydrogel of the present invention is: N-N-isopropylacrylamide 90-10%, methacrylic ester glucan derivative 10-90%.When methacrylic ester glucan derivative (MA-Dex) quality per distribution ratio was lower than 10%, its responsiveness to pH value and ionic strength was not obvious; And when it is higher than 90%, then not obvious to the responsiveness of temperature.Although the quality per distribution ratio of MA-Dex is 10-90%, can finish task of the present invention, mass percent component better or that purposes is wider is 40-60%.The molecular weight of described dextran is 1-4 ten thousand, crosses low or too high molecular weight and all is unfavorable for realizing purpose of the present invention.
Preparation method at invention environmental response type hydrogel comprises three steps:
(1) mixed solution of preparation dextran and dimethyl sulfoxide (DMSO).The dextran and the solvent dimethyl sulfoxide (DMSO) that in container, add definite quality per-cent, 50-80 ℃ is stirred to dextran and is dissolved in the solvent fully and is cooled to room temperature; The amount ratio of dextran consumption and dimethyl sulfoxide (DMSO) is 1g: 10ml;
(2) synthetic glucan derivative.Under the nitrogen atmosphere condition, in (1) step gained mixing solutions, add catalyzer 4-Dimethylamino pyridine, treat its dissolving after, add glytidyl methacrylate, mixing solutions is through stirring, and room temperature condition reacts after 24-72 hour down, add in the hydrochloric acid again and the 4-Dimethylamino pyridine, stopped reaction; With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3-5 time, the gained white powder is glucan derivative.The mol ratio a of glucopyranose residue weight is 1 in the consumption of described glytidyl methacrylate and the dextran: 3-1: 8, the mass percent that the consumption of 4-Dimethylamino pyridine accounts for the dextran consumption is 20%, and the mol ratio b of the consumption of hydrochloric acid consumption and 4-Dimethylamino pyridine is 1; The time that described room temperature condition reacts down is lower than 24 hours, react insufficient, and it is also not obvious to be higher than 72 hours reaction effects.Consider quality and balance of efficiency, mixing solutions generally reacts at ambient temperature was advisable in 40-50 hour.
(3) synthetic N-N-isopropylacrylamide and methacrylic ester glucan derivative gel copolymer.Above-mentioned N-N-isopropylacrylamide and methacrylic ester glucan derivative are dissolved in respectively in the deionized water by described mass percent, add initiator ammonium persulfate or Potassium Persulphate again, the gained mixing solutions is filled N
2Gas 10-20 minute, add an amount of accelerant N then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is poured in the mould, sealing, room temperature reaction 8-24 hour, the better room temperature reaction time was 12-18 hour.Be cut into fritter then, bubble is gone in the distilled water, changes water every day at least 1 time, removing unreacted small molecules, and makes its abundant swelling at room temperature.Get final product after 4-7 days environmental response type N-N-isopropylacrylamide and dextran copolymer hydrogel.The mass percent that total consumption of wherein said methacrylic ester glucan derivative and N-N-isopropylacrylamide accounts for solvent load is 15-50%, and better mass percent is 15-25%; The mass percent that the consumption of initiator accounts for methacrylic ester glucan derivative and the total consumption of N-N-isopropylacrylamide is 1-3%, and the consumption of promotor and the mol ratio c of initiator amount are 1: 1-1: 3.
Introduce specific embodiments of the invention below:
Embodiment 1:
Under the nitrogen atmosphere condition, 50 ℃ are dissolved in 30g dextran (Dextran 40000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves fully and is cooled to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 8.4ml GMA again; Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 72h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 3 MA-Dex.Above-mentioned MA-Dex 0.4g and NIPA 3.6g (r=10%) are dissolved in the deionized water of 20ml, add the ammonium persulphate of 0.04g again.Mixing solutions fills N
2Gas 10min, add accelerant N then rapidly, N, N`, N`-Tetramethyl Ethylene Diamine 0.10ml, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 24 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 10% methacrylic ester glucan derivative after 4 days.
Embodiment 2:
Under the nitrogen atmosphere condition, 50 ℃ are dissolved in 20g dextran (Dextran 40000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 5.6ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 48h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 5 times, the gained white powder is a=1: 3 MA-Dex.Above-mentioned MA-Dex 0.8g and NIPA 1.2g (r=40%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.02g again.Mixing solutions fills N
2Gas 15min, the N that adds 0.05ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 40% methacrylic ester glucan derivative after 5 days.
Embodiment 3:
Under the nitrogen atmosphere condition, 60 ℃ are dissolved in 10g dextran (Dextran 10000) in the 100ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 2g after the room temperature, add 2.8ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 24h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 3 MA-Dex.Above-mentioned MA-Dex 1.0g and NIPA 1.0g (r=50%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.02g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.10ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 50% methacrylic ester glucan derivative after 7 days.
Embodiment 4:
Under the nitrogen atmosphere condition, 70 ℃ are dissolved in 30g dextran (Dextran 40000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 8.4ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 400h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 3 MA-Dex.Above-mentioned MA-Dex 4.8g and NIPA 3.2g (r=60%) are dissolved in the deionized water of 20ml, add the Potassium Persulphate of 0.04g again.Mixing solutions fills N
2Gas 20min, the N that adds 0.10ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 24 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 60% methacrylic ester glucan derivative after 6 days.
Embodiment 5:
Under the nitrogen atmosphere condition, 80 ℃ are dissolved in 20g dextran (Dextran 40000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 5.6ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 48h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 3 MA-Dex.Above-mentioned MA-Dex 1.6g and NIPA 0.4g (r=80%) are dissolved in the deionized water of 10ml, add the Potassium Persulphate of 0.02g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.05ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 80% methacrylic ester glucan derivative after 7 days.
Embodiment 6:
Under the nitrogen atmosphere condition, 50 ℃ are dissolved in 30g dextran (Dextran 40000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 4.2ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 500h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 6 MA-Dex.Above-mentioned MA-Dex 0.8g and NIPA 3.2g (r=20%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.08g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.20ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 8 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 20% methacrylic ester glucan derivative after 4 days.
Embodiment 7:
Under the nitrogen atmosphere condition, 60 ℃ are dissolved in 20g dextran (Dextran 40000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 2.8ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 48h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 6 MA-Dex.Above-mentioned MA-Dex 0.8g and NIPA 1.2g (r=40%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.02g again.Mixing solutions fills N
2Gas 15min, the N that adds 0.10ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two specification sheet glass, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 40% methacrylic ester glucan derivative after 5 days.
Embodiment 8:
Under the nitrogen atmosphere condition, 65 ℃ are dissolved in 10g dextran (Dextran 10000) in the 100ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 2g after the room temperature, add 1.4ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 24h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 6 MA-Dex.Above-mentioned MA-Dex 1.0g and NIPA 1.0g (r=50%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.02g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.15ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 15 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 50% methacrylic ester glucan derivative after 5 days.
Embodiment 9:
Under the nitrogen atmosphere condition, 70 ℃ are dissolved in 30g dextran (Dextran 40000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 4.2ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 72h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 6 MA-Dex.Above-mentioned MA-Dex3.6g and NIPA 2.4g (r=60%) are dissolved in the deionized water of 20ml, add the Potassium Persulphate of 0.06g again.Mixing solutions fills N
2Gas 20min, the N that adds 0.30ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 60% methacrylic ester glucan derivative after 6 days.
Embodiment 10:
Under the nitrogen atmosphere condition, 80 ℃ are dissolved in 20g dextran (Dextran 20000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 2.8ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 50h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 6 MA-Dex.Above-mentioned MA-Dex 1.6g and NIPA 0.4g (r=80%) are dissolved in the deionized water of 10ml, add the Potassium Persulphate of 0.02g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.05ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 18 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 80% methacrylic ester glucan derivative after 7 days.
Embodiment 11:
Under the nitrogen atmosphere condition, 50 ℃ are dissolved in 30g dextran (Dextran 40000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 3.15ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 72h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 8 MA-Dex.Above-mentioned MA-Dex 0.8g and NIPA 3.2g (r=20%) are dissolved in the deionized water of 20ml, add the ammonium persulphate of 0.04g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.10ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 8 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 20% methacrylic ester glucan derivative after 4 days.
Embodiment 12:
Under the nitrogen atmosphere condition, 55 ℃ are dissolved in 20g dextran (Dextran 20000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 2.1ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 45h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 5 times, the gained white powder is a=1: 8 MA-Dex.Above-mentioned MA-Dex 0.8g and NIPA 1.2g (r=40%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.02g again.Mixing solutions fills N
2Gas 15min, the N that adds 0.05ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 12 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 40% methacrylic ester glucan derivative after 5 days.
Embodiment 13:
Under the nitrogen atmosphere condition, 60 ℃ are dissolved in 10g dextran (Dextran 40000) in the 100ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 2g after the room temperature, add 1.05ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 24h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3 times, the gained white powder is a=1: 8 MA-Dex.Above-mentioned MA-Dex 1.5g and NIPA 1.5g (r=50%) are dissolved in the deionized water of 10ml, add the ammonium persulphate of 0.09g again.Mixing solutions fills N
2Gas 10min, the N that adds 0.45ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 16 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 50% methacrylic ester glucan derivative after 6 days.
Embodiment 14:
Under the nitrogen atmosphere condition, 70 ℃ are dissolved in 30g dextran (Dextran 20000) in the 300ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 6g after the room temperature, add 3.15ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 48h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 4 times, the gained white powder is a=1: 8 MA-Dex.Above-mentioned MA-Dex 1.8g and NIPA 1.2g (r=60%) are dissolved in the deionized water of 20ml, add the Potassium Persulphate of 0.06g again.Mixing solutions fills N
2Gas 20min, the N that adds 0.30ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by two glass sheets, sealing, room temperature reaction was cut into fritter after 20 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 60% methacrylic ester glucan derivative after 6 days.
Embodiment 15:
Under the nitrogen atmosphere condition, 80 ℃ are dissolved in 20g dextran (Dextran 40000) in the 200ml dimethyl sulfoxide (DMSO) in container, treat that it dissolves to be cooled to fully to add catalyzer 4-Dimethylamino pyridine 4g after the room temperature, add 2.10ml GMA again.Mixing solutions is through stirring, and room temperature condition adds a certain amount of hydrochloric acid behind the reaction 50h down, with in and the 4-Dimethylamino pyridine, stopped reaction.With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 5 times, the gained white powder is a=1: 8 MA-Dex.Above-mentioned MA-Dex 9.0g and NIPA 1.0g (r=90%) are dissolved in the deionized water of 10ml, add the Potassium Persulphate of 0.10g again.Mixing solutions fills N
2Gas 20min, the N that adds 0.25ml then rapidly, N, N`, the N`-Tetramethyl Ethylene Diamine is done promotor, pour in the mould of making by sheet glass, sealing, room temperature reaction was cut into fritter after 24 hours, and bubble is gone in the distilled water, change water at least 1 time every day removing unreacted small molecules, and make its abundant swelling at room temperature.The gained gel is the environmental response type copolymer hydrogel that the present invention contains 90% methacrylic ester glucan derivative after 7 days.
Claims (5)
1. environmental response type copolymer hydrogel, its mass percent component is:
N-N-isopropylacrylamide 90-10%,
Methacrylic ester glucan derivative 10-90%.
2. environmental response type copolymer hydrogel according to claim 1 is characterized in that described mass percent component is:
N-N-isopropylacrylamide 60-40%,
Methacrylic ester glucan derivative 40-60%.
3. the preparation method of environmental response type copolymer hydrogel according to claim 1 and 2 is characterized in that this preparation method comprises the steps:
(1) mixed solution of preparation dextran and dimethyl sulfoxide (DMSO); Add dextran and dimethyl sulfoxide (DMSO) in container, 50-80 ℃ is stirred to dextran and is dissolved in the solvent fully and is cooled to room temperature; The amount ratio of dextran consumption and dimethyl sulfoxide (DMSO) is 1g: 10ml;
(2) synthesize methyl acrylic acid esters glucan derivative; Under the nitrogen atmosphere condition, in (1) step gained mixing solutions, add catalyzer 4-Dimethylamino pyridine, treat its dissolving after, add glytidyl methacrylate, mixing solutions is through stirring, and room temperature condition reacts after 24-72 hour down, add in the hydrochloric acid again and the 4-Dimethylamino pyridine, stopped reaction; With the precipitator method gained reaction mixture is vacuumized drying behind dehydrated alcohol repetitive scrubbing 3-5 time, gained is the methacrylic ester glucan derivative; The mol ratio a of glucopyranose residue weight is 1 in the consumption of described glytidyl methacrylate and the dextran: 3-1: 8, the mass percent that the consumption of 4-Dimethylamino pyridine accounts for the dextran consumption is 20%, and the mol ratio b of the consumption of hydrochloric acid consumption and 4-Dimethylamino pyridine is 1;
(3) synthetic N-N-isopropylacrylamide and methacrylic ester glucan derivative gel copolymer; Above-mentioned N-N-isopropylacrylamide and methacrylic ester glucan derivative are dissolved in respectively in the deionized water by described mass ratio, add initiator ammonium persulfate or Potassium Persulphate again, the gained mixing solutions is filled N
2Gas 10-20 minute, add an amount of accelerant N, N, N ｀ then rapidly, N ｀-Tetramethyl Ethylene Diamine, pour in the mould, sealing is after room temperature reaction 8-24 hour, be cut into fritter, bubble is gone in the distilled water, changes water every day at least 1 time, promptly gets environmental response type N-N-isopropylacrylamide and methacrylic ester glucan derivative copolymer hydrogel after 4-7 days; The mass percent that total consumption of wherein said methacrylic ester glucan derivative and N-N-isopropylacrylamide accounts for solvent load is 15-50%, the mass percent that the consumption of initiator accounts for methacrylic ester glucan derivative and the total consumption of N-N-isopropylacrylamide is 1-3%, and the consumption of promotor and the mol ratio c of initiator amount are 1: 1-1: 3.
4. the preparation method of environmental response type copolymer hydrogel according to claim 3 is characterized in that the mixing solutions in described (2) step reacted 40-50 hour at ambient temperature, and described mol ratio a is 1: 3-1: 6.
5. according to the preparation method of claim 3 or 4 described environmental response type copolymer hydrogels, the mass percent that the total consumption that it is characterized in that methacrylic ester glucan derivative in described (3) step and N-N-isopropylacrylamide accounts for solvent load is 15-25%; The room temperature reaction time is 12-18 hour.
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