High-strength, anti-freezing and conductive chitosan/acrylamide dual-network hydrogel and preparation method thereof

A technology of acrylamide and chitosan, which is applied in the field of polymer hydrogel, can solve the problems of complex preparation process and no mention of mechanical properties, and achieve the effects of improving mechanical properties, good biocompatibility, and good mechanical properties

Inactive Publication Date: 2019-01-04
CHANGCHUN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This hydrogel has excellent multifunctionality, but its mechanical...

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 The steps and conditions of a preparation method of chitosan / acrylamide double network hydrogel are as follows:

[0020] (1) Configure chitosan aqueous solution

[0021] Configuration mass fraction is the chitosan aqueous solution of 5.0wt%, weighs the chitosan that quality is 0.2g, adds the acetic acid solution of 20mlpH=3 wherein, puts in the water bath and stirs and heats up to 40 ℃; Completely dissolve in the acetic acid solution, stop heating;

[0022] (2) Preparation of chitosan / acrylamide semi-IPN hydrogel

[0023] a. Add 3.8g of acrylamide to the solution obtained in step (1), that is, the mass fraction of chitosan / (acrylamide+chitosan) is 5.0wt%), and then add 0.002g of crosslinking agent (N ,N,-methylenebisacrylamide) and 0.02g initiator (potassium persulfate), stirred for 20 minutes to obtain a uniform mixed solution;

[0024] b. Put the homogeneously mixed solution obtained in the above step a into a sealed mold, heat to 60°C, and keep the te...

Embodiment 2

[0038] Embodiment 2 The steps and conditions of a preparation method of chitosan / acrylamide double network hydrogel are as follows:

[0039] (1) Configure chitosan aqueous solution

[0040] Configuration mass fraction is the chitosan aqueous solution of 10.0wt%, weighs the chitosan that quality is 0.3g, adds the acetic acid solution of 20mlpH=3 wherein, puts in the water bath and stirs and heats up to 50 ℃; Wait for chitosan Completely dissolve in the acetic acid solution, stop heating;

[0041] (2) Preparation of chitosan / acrylamide semi-IPN hydrogel

[0042] a. Add 3.7g of acrylamide to the solution obtained in step (1), that is, the mass fraction of chitosan / (acrylamide+chitosan) is 7.5wt%), and then add 0.002g of crosslinking agent (N ,N,-methylenebisacrylamide) and 0.02g initiator (potassium persulfate), stirred for 20 minutes to obtain a uniform mixed solution;

[0043] b. Put the homogeneously mixed solution obtained in the above step a into a sealed mold, heat to 60°C...

Embodiment 3

[0047] Embodiment 3 The steps and conditions of a preparation method of chitosan / acrylamide double network hydrogel are as follows:

[0048] (1) Configure chitosan aqueous solution

[0049] Configure an aqueous solution of chitosan with a mass fraction of 10.0%, weigh 0.4 g of chitosan, add 20 ml of acetic acid solution at pH=3 to it, stir in a water bath and heat up to 50° C.; Dissolve in acetic acid solution, stop heating;

[0050] (2) Preparation of chitosan / acrylamide semi-IPN hydrogel

[0051] a. Add 3.6g of acrylamide to the solution obtained in step (1), that is, the mass fraction of chitosan / (acrylamide+chitosan) is 10.0wt%), and then add 0.002g of crosslinking agent (N ,N,-methylenebisacrylamide) and 0.02g initiator (potassium persulfate), stirred for 20 minutes to obtain a uniform mixed solution;

[0052] b. Put the homogeneously mixed solution obtained in the above step a into a sealed mold, heat to 70°C, and keep the temperature constant for 8 hours. After the r...

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Abstract

The invention provides a preparation method of high-strength, anti-freezing and conductive chitosan/acrylamide dual-network hydrogel. A first network and a second network interpenetrate to form the chitosan/acrylamide dual-network hydrogel. The first network is physical entanglement or physical crosslinking hydrogel formed by chitosan molecular chains under the action of inorganic salts with different valence states. The second network is hydrogel formed by chemically crosslinking acrylamide. Based on modifiable sites of chitosan, chitosan/acrylamide semi-interpenetrating hydrogel is soaked ininorganic salt solution with different concentration to induce chitosan to form the physical crosslinked network hydrogel. Therefore, the hydrogel achieves good mechanical properties, freezing resistance and conductivity. The highest tensile strength of the hydrogel can reach 450kPa, the hydrogel can still keep a soft state at the temperature of 20 DEG C below zero, the highest conductivity of the hydrogel can reach 200mS/cm, and the application field of the hydrogel is widened.

Description

technical field [0001] The invention provides a high-strength, frost-resistant and conductive chitosan / acrylamide double-network hydrogel and a preparation method thereof, belonging to the technical field of polymer hydrogels. Background technique [0002] Chitosan, as the second largest natural polymer material except cellulose, is the only renewable alkaline polysaccharide polymer obtained from chitin by deacetylation. Chitosan has the characteristics of rich sources, good biocompatibility, biodegradability, drug activity and antibacterial properties, and is widely favored in the fields of food industry, textile industry, environmental protection, medical and health care, etc. It is of great significance for further development and application. [0003] Hydrogel is a kind of hydrophilic three-dimensional network polymer. After absorbing water, its weight can reach tens to hundreds of times its own weight. It is insoluble in water itself and can maintain its shape and char...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/56C08F222/38
CPCC08F251/00C08F220/56C08F222/385
Inventor 高光辉徐加俊任秀艳谢继成
Owner CHANGCHUN UNIV OF TECH
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