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PAAm/PVA dual-network hydrogel and preparation method thereof

A hydrogel and double-network technology, applied in the field of high-strength hydrogel and high water content, can solve the problems of low hydrogel strength, complicated preparation method, unfavorable application, etc., and achieve low volume swelling rate and simple preparation process Effect

Inactive Publication Date: 2015-06-10
BEIJING NATURE STONE SCI TECH DEVP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently announced double network hydrogel has the following disadvantages. First, the preparation method is complicated and takes a long time. Taking the method of Gong Jianping et al. as an example, it needs to undergo two polymerizations, and each polymerization takes 10 hours; The volume of the first-polymerized hydrogel will swell more than 10 times in the second polymerization, and the strength of the hydrogel obtained by the first polymerization is very low, these characteristics are very unfavorable for the application

Method used

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  • PAAm/PVA dual-network hydrogel and preparation method thereof
  • PAAm/PVA dual-network hydrogel and preparation method thereof
  • PAAm/PVA dual-network hydrogel and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] 1. Dissolve 4g of polyvinyl alcohol (PVA) in 36ml of deionized water at 80°C, and fully dissolve to obtain solution S1.

[0026] 2. Prepare 3M acrylamide, 0.003M N,N'-methylenebisacrylamide, and 0.003M ammonium persulfate aqueous solution to obtain solution S2.

[0027] 3. Mix the solutions S1 and S2 according to volume 1:2, seal them in a plastic or glass container and heat in a water bath at 60°C for 2 hours.

[0028] 4. Take the prepared hydrogel and soak it in deionized water for 1 to 7 days. high-strength hydrogels.

Embodiment 2

[0030] 1. Dissolve 4g of polyvinyl alcohol (PVA) in 72ml of deionized water at 80°C, and fully dissolve to obtain solution S1.

[0031] 2. Prepare 5M acrylamide, 0.004M N,N'-methylenebisacrylamide, and 0.004M ammonium persulfate aqueous solution to obtain solution S2.

[0032] 3. Mix solutions S1 and S2 at a ratio of 1:3, seal them in a plastic or glass container and heat in a water bath at 60°C for 2 hours.

[0033] 4. Take the prepared hydrogel and soak it in deionized water for 1 to 7 days. high-strength hydrogels.

[0034] 5. The obtained hydrogel was soaked in 0.1 M sodium borate aqueous solution for 1 hour, and the obtained hydrogel was soaked in deionized water for 1 to 7 days. A modified high-strength hydrogel is obtained.

Embodiment 3

[0036] 1. Dissolve 4g of polyvinyl alcohol (PVA) in 50ml of deionized water at 80°C and fully dissolve to obtain solution S1.

[0037] 2. Prepare 4M acrylamide, 0.005M N,N'-methylenebisacrylamide, and 0.003M ammonium persulfate aqueous solution to obtain solution S2.

[0038] 3. Mix solutions S1 and S2 at a ratio of 1:1, seal them in plastic or glass containers and heat them in a water bath at 60°C for 2 hours.

[0039] 4. Take the prepared hydrogel and soak it in deionized water for 1 to 7 days. high-strength hydrogels.

[0040] 5. The obtained hydrogel was soaked in 0.1 M glutaraldehyde aqueous solution for 4 hours, and the obtained hydrogel was soaked in deionized water for 1 to 7 days. A modified high-strength hydrogel is obtained.

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Abstract

The invention provides PAAm / PVA dual-network hydrogel and a preparation method thereof. The dual-network hydrogel is PAAm / PVA dual-network hydrogel based on acrylamide (AAm) and polyvinyl alcohol (PVA), which is high in strength and high in moisture content. The dual-network hydrogel is prepared by the following steps: dissolving the polyvinyl alcohol into water to obtain a solution S1; dissolving the acrylamide, a crosslinking agent and an initiator into water to obtain a solution S2; mixing the solution S1 with the solution S2 at a certain ratio to obtain a solution S3; and obtaining the PAAm / PVA dual-network hydrogel through hot or / and light or / and redox initiated polymerization. The dual-network hydrogel can also be further crosslinked through the crosslinking agents such as glutaraldehyde and sodium borate to change the mechanical property. The PAAm / PVA dual-network hydrogel has the characteristics of being high in balanced water absorption rate (EWC), high in strength, convenient to prepare, and low in swelling degree, and is molded once.

Description

technical field [0001] The invention relates to the technical field of high water content and high strength hydrogel, in particular to a PAAm / PVA double network hydrogel based on acrylamide (AAm) and polyvinyl alcohol (PVA) and a preparation method thereof. Background technique [0002] Hydrogel contains a large amount of water in the hydrophilic polymer network, which is very close to the structure of human tissue. One of the key problems in the application of artificially synthesized hydrogel is that its strength is relatively low, which cannot meet the needs of the application environment. . Since Gong Jianping and others prepared double network hydrogel in 2003 (Adv.Mater.2003, 15, No.14, July 17), this kind of hydrogel with high strength and high water content has been paid attention to by scientific researchers. . The structure characteristic of the double network hydrogel is that it contains two independent network structures: one is a polyelectrolyte network struct...

Claims

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Application Information

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IPC IPC(8): C08J3/075C08J3/24C08L29/04C08L33/26C08K3/38C08K5/07C08F220/56C08F222/38
Inventor 郭兴林江雷
Owner BEIJING NATURE STONE SCI TECH DEVP
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