CN110408053A - A kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels and preparation method thereof - Google Patents
A kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/075—Macromolecular gels
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2333/24—Homopolymers or copolymers of amides or imides
- C08J2333/26—Homopolymers or copolymers of acrylamide or methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
- C08J2471/02—Polyalkylene oxides
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/06—Ethers; Acetals; Ketals; Ortho-esters
Abstract
The invention discloses a kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels and preparation method thereof, and the polyacrylamide organic hydrogels are impregnated in polypropylene glycol by polyacrylamide hydrogel and are made.Free water is become non-f reezing water or readable proof by hydrogen bond action with hydrone by polypropylene glycol, Free water a small amount of at low temperature and readable proof are formed in tiny ice crystal insertion polyacrylamide network, and tiny ice crystal increases gel strength and assigns gel stretcher strain ability by shear yielding.Polypropylene glycol also generates physical entanglement with polyacrylamide macromolecular chain and plays humidification, it is made to show excellent mechanical property under 25 DEG C and 60 DEG C of high temperature.Therefore, the tough freeze proof polyacrylamide organic hydrogels of height provided by the invention not only show at 25 DEG C and excellent mechanical property under 60 DEG C of high temperature, and far below 0 DEG C at a temperature of still have high deformation and fracture toughness, be with a wide range of applications in wider temperature range.
Description
Technical field
The present invention relates to functional polymer material field more particularly to a kind of high tough freeze proof heat-resistance polypropylene amide are organic
Hydrogel and preparation method thereof.
Background technique
Hydrogel is a kind of high molecular material with three-dimensional net structure comprising large quantity of moisture, in organizational project, medicine
The fields such as object controlled release carrier, electronic skin, soft robot are with important application prospects, cause researcher's in recent years
Greatly concern.But the high-moisture characteristic of conventional hydrogel, causes its softness frangible, and mechanical strength is low, environmentally sensitive, weather-proof
Property is poor, and hydrogel can be frozen in when low temperature, loses flexibility, influences normal use.Therefore, design has both high intensity at low temperature
There is important value with the hydrogel of good flexibility.
Water inside hydrogel exists with three kinds of states: first is non-f reezing water, with the hydroxyl on polymer macromolecule chain
Base forms non-f reezing water by hydrogen bond action or unimolecule is hydrated layer, and being cooled to -100 DEG C will not crystallize；Second is that can freeze
Water, the adsorbable hydrone of non-f reezing water form secondary or third level hydration layer, as readable proof, and obvious characteristic is that phase turns
Temperature is at -45 DEG C~-25 DEG C, lower than pure water or the phase transition temperature of Free water；Third is Free water, remaining water is freely
Water, feature phase transition temperature is near -18 DEG C.Because water content is mostly 70% or more in aquogel system, at low temperature water
Free water in gel network will be freezed, and lose flowability, be hardened so as to cause hydrogel, lose flexibility.
The conventional method for preparing freeze proof hydrogel is to introduce the small molecule polyols such as ethylene glycol, glycerine (being commonly called as glycerol) to resist
Freeze agent, small molecule polyol antifreeze can dissolve each other with water arbitrary proportion, change the vapour pressure of cooling water and reduce freezing point, realize
It is freeze proof.For example, Lu Xiong seminar, Southwest Jiaotong University, uses glycerol-water for binary solvent, ultraviolet light-initiated acrylic acid and propylene
Amide monomer copolymerization, and it is compound with the carbon nanotube of poly-dopamine modification, freeze proof hydrogel is prepared, it can be -20 DEG C~60
DEG C temperature range keeps quality to stablize (Adv.Funct.Mater.2018,28,1704195) for a long time.But this method preparation
Hydrogel tensile strength (< 100KPa) and maximum tension deformation (< 800%) is not high.Shenzhen University Zhou Xuechang etc. is by by institute
It prepares calcium alginate/polyacrylamide double-network hydrogel to be put into glycerol and impregnate, the part in gel is displaced using glycerol
Water obtains double-network hydrogel that is freeze proof, not doing, and tensile stress is about 1500% in 250KPa or so, largest deformation amount, not
The performance of gel under low temperature is provided.(Angew.Chem.Int.Ed.2018,57,6568-6571).Patent
CN201811482152.4 discloses a kind of preparation method of high tough sticky weather-resistance polyethylene alcohol radical double-network hydrogel, with poly-
Vinyl alcohol is starting material, it is dissolved by heating in deionized water after polyvinyl alcohol water solution is made, in gained polyvinyl alcohol
Glycerol, sodium chloride, acrylamide, acrylic acid, crosslinking agent N, N '-methylene-bisacrylamide and initiator are added in aqueous solution
Irgacure 2959, then under ultraviolet light through the light-initiated polyacrylamide being chemically crosslinked-acrylic acid cross-linked structure, from
And construct out the tough polyvinyl alcohol based hydrogel of height of dual network.Tensile strength is in 1MPa or so, and elongation at break is 1000%
Left and right, does not provide the performance of gel under low temperature.
The preparation method of the freeze proof hydrogel of aforementioned report is by small molecule polyol antifreeze such as glycerol, second two
Alcohol, sorbierite or its blend and the water in hydrogel are miscible, to reduce the freezing point of water.But small molecule polyol is for hydrogel
System has no humidification, and the improvement of mechanical property, which mainly passes through, introduces nanofiller (such as carbon nanotube) or building dual network knot
Structure is realized.It introduces nanofiller or constructs the preparation process complexity of dual network structure, therefore need a kind of simple and easy side
Method still keeps the polyacrylamide hydrogel of large deformation ability and obdurability to obtain in a low temperature of far below 0 DEG C.
Summary of the invention
The purpose of the present invention is to provide a kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels and its preparation sides
Method overcomes and is needed now by introducing the complicated approach such as nanofiller come the problem of enhancing aquogel system.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, the tough freeze proof heat-resistance polypropylene amide of height have
Machine hydrogel is impregnated in polypropylene glycol by polyacrylamide hydrogel and is made.
Optionally, the number-average molecular weight of the polypropylene glycol is 200~2000, and the soaking time is 5~180min.
Optionally, the number-average molecular weight of the polypropylene glycol is 500, and the soaking time is 30min.
Optionally, the polyacrylamide hydrogel is made, the polymer list by the aggregated reaction of polymer monomer
Body is acrylamide monomer；
It is carried out under the conditions of the polymerization reaction is existing for solvent, crosslinking agent, initiator and the catalyst.
Optionally, the solvent is water, and the crosslinking agent is N, and N '-methylene-bisacrylamide, the initiator was
Ammonium sulfate, the catalyst are tetramethylethylenediamine.
Optionally, the quality of the crosslinking agent is the 0.02%~0.18% of the quality of the polymer monomer；It is described to draw
The quality of hair agent is the 0.1%~0.2% of the quality of the polymer monomer.
Optionally, the proportion of the polymer monomer, solvent, crosslinking agent, initiator and catalyst be 13.8g:46~
The μ of 56mL:2.76~24.84mg:13.8~41.4mg:22~44 L.
Optionally, the proportion of the polymer monomer, solvent, crosslinking agent, initiator and catalyst is 13.8g:46mL:
4mg:32.2mg:22 μ L.
A kind of preparation method of the tough freeze proof heat-resistance polypropylene amide organic hydrogels of foregoing height, including following step
It is rapid:
Polyacrylamide hydrogel is impregnated in polypropylene glycol, obtains high tough freeze proof heat-resistance polypropylene amide organic water
Gel.
Optionally, the poly- propionamide hydrogel is made according to the following steps:
Acrylamide monomer and crosslinking agent are first dispersed in water, initiator is added, instills catalyst later, stirring obtains
Obtain mixed solution；
Mixed solution is subjected to ultrasonic defoaming；It is 25 DEG C by the reaction temperature control of the mixed solution after ultrasound defoaming, and
Holding 4~for 24 hours, obtain polyacrylamide hydrogel.
Compared with prior art, the invention has the following advantages:
The tough freeze proof heat-resistance polypropylene amide organic hydrogels of height provided by the invention, by polyacrylamide hydrogel poly-
It impregnating and is made in propylene glycol, polypropylene glycol is a kind of oligomer with terminal hydroxy group, hydrogen bond action can be passed through with hydrone,
Free water becomes non-f reezing water or readable proof, and at low temperature, Free water a small amount of at low temperature and readable proof form small ice
In crystalline substance insertion polyacrylamide network, forms a kind of slurry that the mixture by tiny ice crystal and polypropylene glycol solution forms and coagulate
Glue.On the one hand these tiny ice crystals increase gel strength, on the other hand again can be big by shear yielding imparting gel
Stretcher strain ability, the similar rigid nanoparticle of enhancing mechanism enhance elastomer mechanism.In addition, polypropylene glycol can be with poly- third
Acrylamide macromolecular chain generates physical entanglement and plays humidification, keeps it equal in such as 30 DEG C or so of room temperature and such as 60 DEG C or so of high temperature
It can express excellent mechanical property.
Therefore, the tough freeze proof polyacrylamide organic hydrogels of height provided by the invention not only at room temperature with 60 DEG C of high temperature
Under show excellent mechanical property, and far below 0 DEG C at a temperature of still there is high deformation and fracture toughness, compared with
Mechanical property is all very excellent in wide temperature range.After tested, the tough freeze proof polyacrylamide organic hydrogels of the height exist
It can be more than 5000% that deflection is stretched at 30 DEG C of room temperature, and through -20 DEG C of freezings, post-tensioning deflection still can be more than for 24 hours
2000% and tensile strength to stretch deflection up to 1MPa, at 60 DEG C of high temperature still can be more than 1000%, tensile strength is more than
180KPa.In wider temperature range physical property be superior to impregnate glycerine sample, especially at -20 DEG C of low temperature and
The excellent properties shown at 60 DEG C of high temperature, the modified hydrogel of existing small molecule polyol cannot achieve.The height is tough
Freeze proof polyacrylamide organic hydrogels have widened the use temperature range of polyacrylamide hydrogel material significantly, are had
Excellent properties be with a wide range of applications in fields such as organizational projects.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is the polyacrylamide hydrogel that different time is impregnated in polypropylene glycol 500 that the embodiment of the present invention 4 provides
The DSC curve of cooling and heating.
Fig. 2 is the polyacrylamide hydrogel that different time is impregnated in polypropylene glycol 500 that the embodiment of the present invention 4 provides
Tensile property curve at 30 DEG C.
Fig. 3 is the polyacrylamide hydrogel that different time is impregnated in polypropylene glycol 500 that the embodiment of the present invention 4 provides
Tensile property curve at -20 DEG C.
Fig. 4 is the polyacrylamide hydrogel that different time is impregnated in polypropylene glycol 500 that the embodiment of the present invention 4 provides
Tensile property curve at -60 DEG C.
Fig. 5 is the polyacrylamide hydrogel impregnated in different molecular weight polypropylene glycol that the embodiment of the present invention 5 provides
The DSC curve of cooling and heating.
Specific embodiment
To make goal of the invention of the invention, feature, advantage can be more obvious and understandable, below in conjunction with specific reality
Example is applied, technical solution of the present invention is carried out clear, is fully described by, it is clear that the embodiments described below are only this hair
Bright a part of the embodiment, and not all embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not having
All other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The present invention provides a kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, the height is tough freeze proof heat-resisting
Polyacrylamide organic hydrogels are impregnated in polypropylene glycol by polyacrylamide hydrogel and are made.
Polypropylene glycol, also known as propylene glycol polyethers are colorless and transparent oily thick liquid at 25 DEG C.Polypropylene glycol is a kind of
Oligomer with terminal hydroxy group, molecular weight is much larger than small molecule polyols such as ethylene glycol and glycerine.Polypropylene glycol can be with moisture
Free water is become non-f reezing water or readable proof, at low temperature, in polyacrylamide hydrogel system by hydrogen bond action by son
The small ice crystal that a small amount of Free water and readable proof are formed forms a kind of mixture by tiny ice crystal and polypropylene glycol solution and forms
Pulp gel.On the one hand these tiny ice crystals increase gel strength, on the other hand can be assigned again by shear yielding
The high stretcher strain ability of gel, the similar rigid nanoparticle of enhancing mechanism enhance elastomer mechanism.In addition, polypropylene glycol can
Humidification is played to generate physical entanglement with polyacrylamide macromolecular chain, makes it in such as 30 DEG C or so of room temperature and high temperature example
Such as 60 DEG C or so can express excellent mechanical property.Therefore, the tough freeze proof heat-resistance polypropylene amide of height provided by the invention
Organic hydrogels have widened the use temperature range of polyacrylamide hydrogel material significantly.
In embodiments of the present invention, the number-average molecular weight of the polypropylene glycol is 200~2000, and the soaking time is 5
~180min.
Selection about polypropylene glycols amount need to account for from many aspects.On the one hand, the molecular weight of polypropylene glycol is got over
Height, the physical entanglement generated with poly- propionamide macromolecular chain is more, and humidification is more obvious.On the other hand, polypropylene glycol and water
Intersolubility increase with molecular weight and decline, the polypropylene glycol of lower molecular weight can be dissolved in water, the polypropylene glycol of higher molecular weight
It is only very slightly soluble in water；And the viscosity of the higher polypropylene glycol of molecular weight increases, and spreads slower, required soaking time and extends.Cause
The polypropylene glycol of this selection suitable molecular weight is extremely important.
In the embodiment of the present invention, the number-average molecular weight of the polypropylene glycol is chosen in particular from 400,500,600,1000,1500
With one of 2000, preferably 500.
When the molecular weight of the polypropylene glycol is 500, the corresponding soaking time is preferably 30min.It is poly- impregnating
During propylene glycol, polypropylene glycol diffusion rate ratio into polyacrylamide hydrogel is very fast at the beginning, gradually subtracts after 30min
Slowly, 180min basically reaches balance.
Polyacrylamide hydrogel of the present invention is made, the polymerization reaction by the aggregated reaction of polymer monomer
It is carried out under the conditions of existing for solvent, crosslinking agent, initiator and the catalyst.
Wherein, the polymer monomer is acrylamide monomer, and the solvent is water, and the crosslinking agent is N, N '-methylene
Base bisacrylamide, the initiator are ammonium persulfate, and the catalyst is tetramethylethylenediamine.
The quality of the crosslinking agent is the 0.02%~0.18% of the quality of the polymer monomer；The matter of the initiator
Amount is the 0.1%~0.3% of the quality of the polymer monomer.It the polymer monomer, solvent, crosslinking agent, initiator and urges
The proportion of agent is the μ of 13.8g:46~56mL:2.76~24.84mg:13.8~41.4mg:22~44 L.
The present invention also provides a kind of preparation methods of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, including with
Lower step:
Polyacrylamide hydrogel is impregnated in polypropylene glycol, obtains high tough freeze proof heat-resistance polypropylene amide organic water
Gel.
Wherein, the poly- propionamide hydrogel is made according to the following steps:
Acrylamide monomer and crosslinking agent are first dispersed in water, initiator is added, instills catalyst later, stirring obtains
Obtain mixed solution；
Mixed solution is subjected to ultrasonic defoaming；It is 25 DEG C by the reaction temperature control of the mixed solution after ultrasound defoaming, and
Holding 4~for 24 hours, obtain polyacrylamide hydrogel.
The preparation method and the tough freeze proof heat-resistance polypropylene amide organic hydrogels of aforementioned height are based on same invention structure
Think, the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height obtained using the preparation method have aforementioned height tough anti-
Freeze the performance and effect of heat-resistance polypropylene amide organic hydrogels.Crosslinking agent, initiator and catalyst etc. in the preparation method
Selection and the molecular weight and soaking time etc. of proportion and polypropylene glycol and same as before, details are not described herein.
After tested, deflection is stretched under the tough freeze proof heat-resistance polypropylene amide organic hydrogels room temperature of height provided by the invention
It can be more than 5000%；Through -20 DEG C of freezings, post-tensioning deflection still can be more than 2000% for 24 hours, and tensile strength is reachable
1MPa；It still can be more than 1000% that deflection is stretched at 60 DEG C of high temperature, and tensile strength is more than 180KPa.It is freeze proof that the height is tough
Heat-resistance polypropylene amide organic hydrogels physical property in wide temperature range is superior to impregnate the sample of glycerine, especially
The high-strength tenacity shown at low temperature, the modified hydrogel of existing small molecule polyol cannot achieve, widen significantly
The use temperature range of polyacrylamide hydrogel material, the excellent properties having have extensive in fields such as organizational projects
Application prospect.
Hereafter invention is described in more detail with specific embodiment.
In following all examples and comparative example, the test of the tensile property of hydrogel is enterprising in universal testing machine
Row, test bars are the standard sample that dumbbell shape cut-off knife is tailored, and length 75mm, middle section width is 4 ± 0.1mm, with a thickness of 2
± 0.2mm, rate of extension 100mm/min.Three samples of every kind of sample test are averaged.
Embodiment 1
A kind of preparation method of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, specifically comprises the following steps:
13.8g acrylamide monomer is weighed, is dissolved in 46ml deionized water, 4.0mg N, N '-di-2-ethylhexylphosphine oxide are added
Acrylamide, magnetic agitation is uniformly dispersed at room temperature, adds the ammonium persulfate of 32.2mg, continues to stir to obtain homogeneous solution, so
22uL tetramethylethylenediamine is taken to instill in above-mentioned mixed solution and persistently stir evenly with liquid-transfering gun afterwards.Solution ultrasound is defoamed
Afterwards, it imports in molding die and reacts 4h at room temperature, obtain polyacrylamide hydrogel.Prepared polyacrylamide hydrogel is existed
30min is impregnated in polypropylene glycol 500, obtains high tough freeze proof heat-resistance polypropylene amide organic hydrogels.
Test result is as follows for tensile property: the tough freeze proof heat-resistance polypropylene amide organic hydrogels stretching of the height is answered at 30 DEG C
Become more than 5000% (sample does not break), batten tensile strength is about 380KPa when elongation strain is 5000%.It is freezed through -20 DEG C
The polyacrylamide organic hydrogels still have good flexibility afterwards for 24 hours, and elongation at break is about 2200%, and tensile strength is
1.05MPa.The polyacrylamide organic hydrogels tensile strength is about 330KPa at 60 DEG C, and elongation at break is about 1600%.
Embodiment 2
A kind of preparation of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, specifically comprises the following steps:
13.8g acrylamide monomer is weighed, is dissolved in 46ml deionized water, 8.0mg N, N '-di-2-ethylhexylphosphine oxide are added
Acrylamide, magnetic agitation is uniformly dispersed at room temperature, adds the ammonium persulfate of 32.2mg, continues to stir to obtain homogeneous solution, so
44uL tetramethylethylenediamine is taken to instill in above-mentioned mixed solution and persistently stir evenly with liquid-transfering gun afterwards.Solution ultrasound is defoamed
Afterwards, it imports in molding die and reacts 6h at room temperature, obtain polyacrylamide hydrogel.Prepared polyacrylamide hydrogel is existed
1h is impregnated in polypropylene glycol 600, obtains high tough freeze proof heat-resistance polypropylene amide organic hydrogels.
Test result is as follows for tensile property: the tough freeze proof heat-resistance polypropylene amide organic hydrogels stretching of the height is answered at 30 DEG C
Become more than 5000% (sample does not break), batten tensile strength is about 480KPa when elongation strain is 5000%.It is freezed through -20 DEG C
The polyacrylamide organic hydrogels elongation at break is about 2100% afterwards for 24 hours, and tensile strength is about 930KPa.This is poly- at 60 DEG C
Acrylamide organic hydrogels tensile strength is about 220KPa, and elongation at break is about 1100%.
Embodiment 3
A kind of preparation of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, specifically comprises the following steps:
13.8g acrylamide monomer is weighed, is dissolved in 46ml deionized water, 6.0mg N, N '-di-2-ethylhexylphosphine oxide are added
Acrylamide, magnetic agitation is uniformly dispersed at room temperature, adds the ammonium persulfate of 41.4mg, continues to stir to obtain homogeneous solution, so
22uL tetramethylethylenediamine is taken to instill in above-mentioned mixed solution and persistently stir evenly with liquid-transfering gun afterwards.Solution ultrasound is defoamed
Afterwards, it imports in molding die and reacts 12h at room temperature, obtain polyacrylamide hydrogel.By prepared polyacrylamide hydrogel
2h is impregnated in polypropylene glycol 2000, obtains high tough freeze proof heat-resistance polypropylene amide organic hydrogels.
Test result is as follows for tensile property: the tough freeze proof heat-resistance polypropylene amide organic hydrogels stretching of the height is answered at 30 DEG C
Become more than 5000% (sample does not break), batten tensile strength is about 700KPa when elongation strain is 4500%.It is freezed through -20 DEG C
The polyacrylamide organic hydrogels elongation at break is about 3500% afterwards for 24 hours, and tensile strength is about 1.27MPa.It should at 60 DEG C
Polyacrylamide organic hydrogels tensile strength is about 260KPa, and elongation at break is about 1300%.
Comparative example 1
13.8g acrylamide monomer is weighed, is dissolved in 46ml deionized water, 6.0mg N, N '-di-2-ethylhexylphosphine oxide are added
Acrylamide, magnetic agitation is uniformly dispersed at room temperature, adds the ammonium persulfate of 32.2mg, continues to stir to obtain homogeneous solution, so
44uL tetramethylethylenediamine is taken to instill in above-mentioned mixed solution and persistently stir evenly with liquid-transfering gun afterwards.Solution ultrasound is defoamed
Afterwards, it imports in molding die and reacts 4h at room temperature, obtain polyacrylamide hydrogel, as a comparison sample 1.
Test result is as follows for tensile property: the polyacrylamide hydrogel tensile strength is about 140KPa at 30 DEG C, fracture
Elongation is about 1000%.The white state that freezes of the polyacrylamide hydrogel batten after -20 DEG C of freezings for 24 hours stretches strong
Degree is about 170KPa, and elongation at break is about 2000%.The polyacrylamide hydrogel tensile strength is about 70KPa at 60 DEG C,
Elongation at break is about 800%.
Comparative example 2
13.8g acrylamide monomer is weighed, is dissolved in 46ml deionized water, 6.0mg N, N '-di-2-ethylhexylphosphine oxide are added
Acrylamide, magnetic agitation is uniformly dispersed at room temperature, adds the ammonium persulfate of 32.2mg, continues to stir to obtain homogeneous solution, so
44uL tetramethylethylenediamine is taken to instill in above-mentioned mixed solution and persistently stir evenly with liquid-transfering gun afterwards.Solution ultrasound is defoamed
Afterwards, it imports in molding die and reacts 4h at room temperature, obtain polyacrylamide hydrogel.Prepared polyacrylamide hydrogel is existed
30min, polyacrylamide hydrogel contrast sample 2 are impregnated in glycerine (glycerol).
Test result is as follows for tensile property: the polyacrylamide hydrogel tensile strength is about 330KPa at 30 DEG C, fracture
Elongation is about 1500%.The polyacrylamide hydrogel batten still keeps excellent toughness after -20 DEG C of freezings for 24 hours, stretches strong
Degree is about 450KPa, and elongation at break is about 2500%.The polyacrylamide hydrogel tensile strength is about 80KPa at 60 DEG C,
Elongation at break is about 700%.
The present invention has also probed into influence of the soaking time to polyacrylamide hydrogel.
Embodiment 4: soaking time comparison
For embodiment 1, the present embodiment only changes soaking time therein, obtains and impregnates not in polypropylene glycol 500
Same time (0min；5min；10min；30min；60min；Polyacrylamide organic hydrogels 120min).
The present embodiment is bent by the DSC (differential scanning calorimetry) that test obtains each polyacrylamide organic hydrogels
Line.Fig. 1 is to impregnate the polyacrylamide organic hydrogels cooling (upward heat release) of different time in polypropylene glycol 500 and heat up
The DSC curve of (heat absorption downwards).Wherein, curve 1-6 representative sample impregnate PPG500 time be respectively 0min, 5min,
10min, 30min, 60min and 120min.As can be seen from Figure 1, do not impregnate the polyacrylamide hydrogel of polypropylene glycol 500-
20 DEG C hereinafter, a large amount of Free water can be freezed, cause hydrogel to be hardened and become fragile, lose flexibility, with impregnating polypropylene glycol 500
Time extend, the content of polypropylene glycol increases in polyacrylamide hydrogel system, and readable proof and non-f reezing water ratio increase
More, Free water ratio is reduced, and is formed tiny ice crystal amount in -20 DEG C or less polyacrylamide organic hydrogels systems and is reduced.
The present embodiment also passes through test and obtains each polyacrylamide organic hydrogels at 30 DEG C, -20 DEG C and 60 DEG C
Tensile property curve.Fig. 2 is that the polyacrylamide organic hydrogels of different time are impregnated in polypropylene glycol 500 at 30 DEG C
Tensile property curve, Fig. 3 are that the polyacrylamide organic hydrogels of different time are impregnated in polypropylene glycol 500 at -20 DEG C
Tensile property curve after freezing for 24 hours.Fig. 4 is the organic water-setting of polyacrylamide that different time is impregnated in polypropylene glycol 500
Tensile property curve of the glue at 60 DEG C.As shown, being impregnated under low temperature (- 20 DEG C), room temperature (30 DEG C) and high temperature (60 DEG C)
The polyacrylamide organic hydrogels tensile property of polypropylene glycol 500 is superior to not impregnate the polyacrylamide of polypropylene glycol 500
Hydrogel, polyacrylamide organic hydrogels comprehensive performance is optimal when soaking time is 30min.
The present invention has also probed into influence of the polypropylene glycols amount to polyacrylamide organic hydrogels.
Embodiment 5: polypropylene glycols amount comparison
For embodiment 1, the present embodiment only changes the molecular weight of polypropylene glycol therein, obtain polypropylene glycol 500,
The polyacrylamide hydrogel of 2h is impregnated in polypropylene glycol 600 and polypropylene glycol 2000, and is tested and obtained each polyacrylamide
The DSC curve of hydrogel.
Fig. 5 is the polyacrylamide hydrogel cooling (upward heat release) impregnated in different molecular weight polypropylene glycol and heats up
The DSC curve of (heat absorption downwards).As can be seen from Figure 5, the polyacrylamide of same time is impregnated in different molecular weight polypropylene glycol
Amine organic hydrogels, free water content are different.Wherein, after polypropylene glycol 500 and polypropylene glycol 600 impregnate, polyacrylamide aqueous amine
Free water disappears substantially in gel, and there is also part Free waters in hydrogel after the immersion of polypropylene glycol 2000.
As seen from the above embodiment, the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height provided by the invention, by gathering
Acrylamide gel is impregnated in polypropylene glycol and is made, and the molecular weight of polypropylene glycol is preferably 500, and soaking time is preferably
30min.The tough freeze proof heat-resistance polypropylene amide organic hydrogels of height provided by the invention no matter at low temperature or at room temperature, power
It is all very excellent to learn performance, it can be more than 5000% that deflection is stretched under room temperature；Through -20 DEG C freezing for 24 hours post-tensioning deflection according to
It so can be more than 2000%, and tensile strength is up to 1MPa；It still can be more than 1000% that deflection is stretched at 60 DEG C of high temperature, and
Intensity is superior to impregnate the sample of glycerine up to 300KPa.The height is tough, and freeze proof heat-resistance polypropylene amide organic hydrogels exist
High obdurability is shown under low temperature, and will not be softened at high temperature, and that has widened polyacrylamide hydrogel significantly uses temperature
Spend range.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of high tough freeze proof heat-resistance polypropylene amide organic hydrogels, which is characterized in that the tough freeze proof resistance to hot polymerization of height
Acrylamide organic hydrogels are impregnated in polypropylene glycol by polyacrylamide hydrogel and are made.
2. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 1, which is characterized in that described poly-
The number-average molecular weight of propylene glycol is 200~2000, and the soaking time is 5~180min.
3. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 2, which is characterized in that described poly-
The number-average molecular weight of propylene glycol is 500, and the soaking time is 30min.
4. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 1, which is characterized in that described poly-
Acrylamide gel is made by the aggregated reaction of polymer monomer, and the polymer monomer is acrylamide monomer；
It is carried out under the conditions of the polymerization reaction is existing for solvent, crosslinking agent, initiator and the catalyst.
5. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 4, which is characterized in that described molten
Agent is water, and the crosslinking agent is N, and N '-methylene-bisacrylamide, the initiator is ammonium persulfate, and the catalyst is four
Methyl ethylenediamine.
6. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 5, which is characterized in that the friendship
The quality of connection agent is the 0.02%~0.18% of the quality of the polymer monomer；The quality of the initiator is the polymer
The 0.1%~0.2% of the quality of monomer.
7. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 4, which is characterized in that described poly-
Monomer adduct, solvent, crosslinking agent, initiator and catalyst proportion be 13.8g:46~56mL:2.76~24.84mg:13.8
The μ of~41.4mg:22~44 L.
8. the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 7, which is characterized in that described poly-
Monomer adduct, solvent, crosslinking agent, initiator and catalyst proportion be 13.8g:46mL:4mg:32.2mg:22 μ L.
9. a kind of tough freeze proof heat-resistance polypropylene amide organic hydrogels of height as described in claim 1-8 any claim
Preparation method, which comprises the following steps:
Polyacrylamide hydrogel is impregnated in polypropylene glycol, obtains the high tough freeze proof organic water-setting of heat-resistance polypropylene amide
Glue.
10. the preparation method of the tough freeze proof heat-resistance polypropylene amide organic hydrogels of height according to claim 9, feature
It is, the poly- propionamide hydrogel is made according to the following steps:
Acrylamide monomer and crosslinking agent are first dispersed in water, initiator is added, instills catalyst later, stirring to obtain is mixed
Close solution；
Mixed solution is subjected to ultrasonic defoaming；It is 25 DEG C by the reaction temperature control of the mixed solution after ultrasound defoaming, and keeps 4
~for 24 hours, obtain polyacrylamide hydrogel.
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