CN106750379A - A kind of preparation method of PVA-GO Nanometer composite hydrogels - Google Patents
A kind of preparation method of PVA-GO Nanometer composite hydrogels Download PDFInfo
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- CN106750379A CN106750379A CN201510820568.2A CN201510820568A CN106750379A CN 106750379 A CN106750379 A CN 106750379A CN 201510820568 A CN201510820568 A CN 201510820568A CN 106750379 A CN106750379 A CN 106750379A
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Abstract
The present invention relates to a kind of preparation method of PVA-GO Nanometer composite hydrogels, step is as follows：Polyvinyl alcohol is added in deionized water, polyvinyl alcohol water solution is configured in 95 °C of stirring in water bath heating 2h, then mixed with the GO aqueous solution, graphene oxide content is 5wt% in mixed liquor, graphene oxide layer size is respectively 2 μm, 85 °C of lower magnetic agitations are to forming homogeneous mixture after solution mixing, mixing time is 0.5h, mixture is cast in mould, it is put into refrigerator freezing shaping, cryogenic temperature is -25 °C, time is 20h, then sample is taken out, 2 ~ 4h is placed at room temperature to thaw, freeze-thaw circulation number of times is 7, the final hydrogel for obtaining is dried by freeze-drying method.Gel of the invention is under certain condition stable, even if after melting, the structure remains to keep.
Description
Technical field
The invention belongs to field of material technology, and in particular to a kind of preparation method of PVA-GO Nanometer composite hydrogels.
Background technology
Gel can be defined as macromolecule and its swelling body with tridimensional network insoluble in any solvent.High-molecular gel constitutes a polymer three-dimensional network system by macromolecule and solvent, and system has said solvophilic, can be swelling in a solvent, but insoluble.High-molecular gel generally can be divided into the macromolecule hydrogel with water as solvent and the class of macromolecule lyogel two with organic solvent as solvent.Macromolecule hydrogel can absorb own wt hundred times even thousands of times of water due to containing a large amount of hydrophilic radicals in molecular structure, and water holding capacity is also very strong, even if being not easy to dehydration in the case of pressurization.Because water content is high, most hydrogel has excellent biocompatibility.As macromolecule water uptake material, the aspects such as food, civil engineering, petrochemical industry, agricultural gardening, health care are can be widely applied to.
Polyvinyl alcohol（Abbreviation PVA）, it is by Polymerization of Vac into polyvinyl acetate, by water-soluble polymer obtained by alkali catalyzed alcoholysis.The physical property of polyvinyl alcohol is influenceed by chemical constitution, alcoholysis degree, the degree of polymerization.PVA fiber degree of drawings are high, there is good acidproof, alkaline-resisting, dry heat resistance energy；The easy film forming of PVA, the good mechanical performance of its film, the tensile strength of film is raised and strengthened with the degree of polymerization, alcoholysis degree.Nonirritant because PVA toxicity is very low, the approved such as Japan and the U.S. is used for medicine and food industry.In China, non-fiber purposes is also growing, current some products have been used in specific occasion, play an important role, and the aspect such as production of some products such as the starching of such as terylene, the processing of printing coatings paper and film and television all applies polyvinyl alcohol.Due to containing a large amount of side bases --- hydroxyl on strand, polyvinyl alcohol has good water solubility, additionally, it also has good film forming, bonding force and an emulsibility, and brilliance grease resistance and solvent resistance.Therefore, polyvinyl alcohol is widely used as adhesive（Casting core adhesive, non-woven fabric adhesive, pigment binder）, temporary binder in paper grade (stock) finishing agent and sizing agent, spinning sizing agent, ceramic industry, the emulsifying agent of emulsion polymerization and protective agent, the quenching liquid, cosmetics, oil field chemical and the automotive safety glass that prepare steel.
The synthesis of PVA hydrogels can be divided into three kinds of physical crosslinking method, chemical crosslink technique and radiation cross-linking process according to cross-linking mechanism.Physical crosslinking at present in report using it is most be " freeze-thaw method repeatedly " and " frozen fraction evaporation ", be greatly improved by being physical crosslinking the hydrogel physical and mechanical properties for obtaining, cross-linking process is reversible, but translucency is bad.Can be by changing type of solvent or being improved using methods such as mixed solvents.Japanese Hyon et al. water and DMSO organic solvents, light transmittance PVA hydrogels high are obtained by freezing processing.
The content of the invention
Regarding to the issue above, the present invention is intended to provide a kind of preparation method of PVA-GO Nanometer composite hydrogels.
A kind of preparation method of PVA-GO Nanometer composite hydrogels, step is as follows：
Polyvinyl alcohol is added in deionized water, polyvinyl alcohol water solution is configured in 95 °C of stirring in water bath heating 2h, then mixed with the GO aqueous solution, graphene oxide content is 5 wt% in mixed liquor, graphene oxide layer size is respectively 2 μm, 85 °C of lower magnetic agitations are to forming homogeneous mixture after solution mixing, mixing time is 0.5h, mixture is cast in mould, it is put into refrigerator freezing shaping, cryogenic temperature is -25 °C, time is 20h, then sample is taken out, 2 ~ 4h is placed at room temperature to thaw, freeze-thaw circulation number of times is 7, the final hydrogel for obtaining is dried by freeze-drying method.
The preparation of hydrogel uses freeze-thaw method repeatedly in the present invention.The formation of gel is premised on the contact crosslinking of molecule interchain.The some like structure in cross-linked network is necessarily formd between the chilled treatment of the PVA aqueous solution, macromolecular chain.The PVA aqueous solution under normal temperature, quickly, interchain time that contacts with each other is very short, therefore is difficult to form relatively stable structure for molecular chain movement speed.Freezing processing reduces molecular chain movement speed, there is time of contact more long between macromolecular chain, so that having an opportunity to form hydrogen bond association structure between interchain hydroxyl, the structure can also regard a kind of interchain Cohesional entanglement point as, and it functions as the crosslinking points in cross-linked network.This crosslinking points, once being formed, are under certain condition stable, and its disintegration needs to absorb larger energy.After freezing gel is melted at room temperature, the structure remains to keep.It is that new entanglement point is likely to form on the chain for formed tangled structure by the freezing processing again of the gel after thawing, so after freezing repeatedly, that is, forms water insoluble PVA gels that but can be swelling in water.
Specific embodiment
The present invention is described in further details with reference to specific embodiment.
A kind of preparation method of PVA-GO Nanometer composite hydrogels, step is as follows：
Polyvinyl alcohol is added in deionized water, polyvinyl alcohol water solution is configured in 95 °C of stirring in water bath heating 2h, then mixed with the GO aqueous solution, graphene oxide content is 5 wt% in mixed liquor, graphene oxide layer size is respectively 2 μm, 85 °C of lower magnetic agitations are to forming homogeneous mixture after solution mixing, mixing time is 0.5h, mixture is cast in mould, it is put into refrigerator freezing shaping, cryogenic temperature is -25 °C, time is 20h, then sample is taken out, 2 ~ 4h is placed at room temperature to thaw, freeze-thaw circulation number of times is 7, the final hydrogel for obtaining is dried by freeze-drying method.
Claims (1)
1. a kind of preparation method of PVA-GO Nanometer composite hydrogels, it is characterised in that step is as follows：Polyvinyl alcohol is added in deionized water, polyvinyl alcohol water solution is configured in 95 °C of stirring in water bath heating 2h, then mixed with the GO aqueous solution, graphene oxide content is 5 wt% in mixed liquor, graphene oxide layer size is respectively 2 μm, 85 °C of lower magnetic agitations are to forming homogeneous mixture after solution mixing, mixing time is 0.5h, mixture is cast in mould, it is put into refrigerator freezing shaping, cryogenic temperature is -25 °C, time is 20h, then sample is taken out, 2 ~ 4h is placed at room temperature to thaw, freeze-thaw circulation number of times is 7, the final hydrogel for obtaining is dried by freeze-drying method.
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| CN201510820568.2A CN106750379A (en) | 2015-11-24 | 2015-11-24 | A kind of preparation method of PVA-GO Nanometer composite hydrogels |
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| CN201510820568.2A CN106750379A (en) | 2015-11-24 | 2015-11-24 | A kind of preparation method of PVA-GO Nanometer composite hydrogels |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109400918A (en) * | 2018-11-13 | 2019-03-01 | 上海工程技术大学 | A kind of pH/H2O2Doubling sensitivity intelligent aqueous gel and its preparation method and application |
| CN110105592A (en) * | 2019-05-09 | 2019-08-09 | 武汉工程大学 | A kind of preparation method of high strength poly vinyl alcohol-graphene oxide-polypyrrole composite hydrogel |
| CN111154207A (en) * | 2018-11-07 | 2020-05-15 | 南京工程学院 | Preparation method of high-tensile-stress self-repairing compound |
| CN111171340A (en) * | 2019-12-25 | 2020-05-19 | 浙江浙能技术研究院有限公司 | Photo-thermal evaporation material based on PVA hydrogel and preparation and application thereof |
-
2015
- 2015-11-24 CN CN201510820568.2A patent/CN106750379A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111154207A (en) * | 2018-11-07 | 2020-05-15 | 南京工程学院 | Preparation method of high-tensile-stress self-repairing compound |
| CN109400918A (en) * | 2018-11-13 | 2019-03-01 | 上海工程技术大学 | A kind of pH/H2O2Doubling sensitivity intelligent aqueous gel and its preparation method and application |
| CN109400918B (en) * | 2018-11-13 | 2021-08-27 | 上海工程技术大学 | PH/H2O2Dual-sensitivity intelligent hydrogel and preparation method and application thereof |
| CN110105592A (en) * | 2019-05-09 | 2019-08-09 | 武汉工程大学 | A kind of preparation method of high strength poly vinyl alcohol-graphene oxide-polypyrrole composite hydrogel |
| CN111171340A (en) * | 2019-12-25 | 2020-05-19 | 浙江浙能技术研究院有限公司 | Photo-thermal evaporation material based on PVA hydrogel and preparation and application thereof |
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Application publication date: 20170531 |