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Method for preparing high-strength polyvinyl alcohol-based dual-network hydrogel

A polyvinyl alcohol-based bis, polyvinyl alcohol technology is applied in the field of polymer material preparation, which can solve the problems of complex preparation process of double network gel, low mechanical strength, etc., and achieve good biocompatibility, biodegradability, ultra-high High strength and toughness, simple production process effect

Inactive Publication Date: 2017-05-10
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing high-strength polyvinyl alcohol-based double-network hydrogels. Aiming at the problems of low mechanical strength of existing polyvinyl alcohol hydrogels and complicated preparation process of double-network gels, the method adopts polyethylene Add acrylamide and acrylic acid monomers to the alcohol aqueous solution, first use low-temperature freezing to construct the physical crosslinking network of polyvinyl alcohol, and then obtain the chemical crosslinking network of polyacrylamide-acrylic acid through photoinitiation and chemical crosslinking, thereby constructing polyethylene Alcohol-based double-network high-strength hydrogel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] Described preparation method specifically comprises the following steps:

[0020] 1) Add polyvinyl alcohol into deionized water and dissolve it under heating in a water bath at 70-95°C to obtain an aqueous solution of polyvinyl alcohol;

[0021] 2) Add metered amounts of acrylamide, acrylic acid, N'N methylenebisacrylamide and photoinitiator Irgacure2959 to the aqueous solution of polyvinyl alcohol obtained in step 1), and stir to obtain a uniform solution;

[0022] 3) The homogeneous solution obtained in step 2) was frozen at low temperature and then thawed at room temperature, and then photo-initiated at 365 nm to obtain a polyvinyl alcohol-based double network hydrogel.

[0023] In order to make the content of the present invention easier to understand, the technical solutions of the present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited thereto. The parts involved in the specific embodime...

Embodiment 1

[0025] A preparation method of a high-strength polyvinyl alcohol-based double-network hydrogel, specifically comprising the steps of:

[0026] Take 0.15 parts of polyvinyl alcohol, add it to 12 parts of deionized water, heat at 75° C. and stir to dissolve to obtain an aqueous solution of polyvinyl alcohol. Add 1.5 parts of acrylamide, 0.107 parts of acrylic acid, 0.00081 parts of N’N methylenebisacrylamide and 0.0643 parts of Irgacure2959 into the aqueous solution of polyvinyl alcohol, and heat to dissolve to obtain a uniform solution. The resulting homogeneous solution was placed in -40 o C freezing for 2 h, 20 o Thaw at C for 4 h, and repeat the freezing and thawing process once. The frozen and thawed solution was introduced into the forming mold, and induced under 365 nm ultraviolet light (power 8 W) for 3 h to obtain a high-strength polyvinyl alcohol-based double network hydrogel.

[0027] The test of the tensile properties of the gel is as follows: the tensile test is ...

Embodiment 2

[0030] A preparation method of a high-strength polyvinyl alcohol-based double-network hydrogel, specifically comprising the steps of:

[0031] Take 0.15 parts of polyvinyl alcohol, add 3 parts of deionized water, heat at 80° C. and stir to dissolve to obtain an aqueous solution of polyvinyl alcohol. Add 2.25 parts of acrylamide, 0.165 parts of acrylic acid, 0.00193 parts of N’N methylenebisacrylamide and 0.0483 parts of Irgacure2959 into the aqueous solution of polyvinyl alcohol, and heat to dissolve to obtain a uniform solution. The resulting homogeneous solution was placed in -40 o C freezing for 2 h, 30 o Thaw at C for 4 h, and repeat the freezing and thawing process 5 times. The frozen and thawed solution was introduced into the forming mold, and induced under 365 nm ultraviolet light (power 8 W) for 0.5 h to obtain a high-strength polyvinyl alcohol-based double network hydrogel.

[0032] According to the test method in Example 1, the obtained results are: tensile stren...

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Abstract

The invention discloses a method for preparing high-strength polyvinyl alcohol-based dual-network hydrogel. The method comprises the following steps: taking polyvinyl alcohol as an initial raw material, and heating for dissolving, so as to obtain polyvinyl alcohol aqueous solution; adding metric acrylamide, acrylic acid, a cross-linking agent N'-N-methylene bisacrylamide and an initiator Irgacure2959 into the polyvinyl alcohol solution, and heating for dissolving, so as to obtain a uniform solution; freezing the solution in a low-temperature environment so as to obtain a physical cross-linked network structure of polyvinyl alcohol; performing photo-initiation under ultraviolet light so as to obtain chemically cross-linked polyacrylamide-acrylic acid chemical cross-linking structure, and constructing the high-strength polyvinyl alcohol-based dual-network hydrogel. The physical cross-linked and chemical cross-linked dual-network structures can be sequentially constructed by a one-step process. The preparation method provided by the invention is simple and feasible, the high-strength hydrogel of any shape can be constructed, and the prepared dual-network hydrogel is excellent in mechanical property.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a preparation method of high-strength polyvinyl alcohol-based double network hydrogel. Background technique [0002] Hydrogel is a kind of polymer material with a three-dimensional network structure containing a large amount of water. It has important application prospects in the fields of joint lubrication, biological tissue engineering, and drug controlled release carriers. Hydrogels are often required to have good mechanical properties during use, but conventional hydrogels are usually fragile and have poor mechanical properties, which greatly limit their application range. Polyvinyl alcohol is a water-soluble high molecular polymer that can be prepared by non-petroleum routes, and its properties are between rubber and plastic. Polyvinyl alcohol hydrogel has the advantages of biodegradability and good biocompatibility, and is widely used in ma...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L33/26C08L29/04C08F220/56C08F220/06C08F222/38C08F2/48
CPCC08F2/48C08F220/56C08J3/075C08J3/246C08J2333/26C08J2429/04C08L33/26C08L2203/02C08L2205/04C08L2312/00C08L29/04C08F220/06C08F222/385
Inventor 江献财项南平张星侯琳熙
Owner FUZHOU UNIV
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