Preparation method of high-strength and high-adhesion branched starch composite hydrogel with strong hydrogen bonding effect

A composite hydrogel and pullulan technology, which is applied in the field of polymer materials, can solve problems such as reduction, uneven gel crosslinking, and unstable performance, and achieve simple and easy-to-control processes, uniform hydrogel structure, excellent The effect of adhesion properties

Active Publication Date: 2019-06-04
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after introducing tannic acid into the polymer network, the water content of the hydrogel is greatly reduced to below 40%, and the method of soaking will lead to uneven crosslinking and unstable performance of the gel.

Method used

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  • Preparation method of high-strength and high-adhesion branched starch composite hydrogel with strong hydrogen bonding effect
  • Preparation method of high-strength and high-adhesion branched starch composite hydrogel with strong hydrogen bonding effect
  • Preparation method of high-strength and high-adhesion branched starch composite hydrogel with strong hydrogen bonding effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step 1): Weigh 3.0000g of Amy (100mg / mL) and 0.9278g of PVA (3wt%) into a three-necked flask, add 30mL of deionized water, and stir in a water bath at 100°C for 1.5 hours to obtain a uniform mixed solution.

[0030] Step 2): Weigh 17.0592g AAm (8mol / L) and 0.0351g KA (0.008mol / L) respectively into the mixed solution of step 1), stir in a water bath at 60°C for 30 minutes under the condition of avoiding light, and prepare A mixed solution of 100 mg / mL of Amy, 3 wt % of PVA relative to the solvent deionized water, and 8 mol / L of AAm was obtained.

[0031] Step 3): inject the mixed solution obtained in step 2) into a glass mold under light-shielding conditions, and place it under an ultraviolet light at 20 cm for 5-7 hours to obtain a pre-polymerized Amy hydrogen-bonded cross-linked PAAm hydrogel.

[0032] Step 4): The pre-polymerized hydrogel obtained in step 3) was frozen in a refrigerator at -20°C for 20 hours, and then thawed at 25°C for 4 hours to obtain a high-streng...

Embodiment 2

[0036] Step 1): Weigh 4.5000g of Amy (150mg / mL) and 0.9278g of PVA (3wt%) into a three-necked flask, then add 30mL of deionized water, and stir in a water bath at 100°C for 1.5 hours to obtain a uniform mixed solution.

[0037] Step 2): Weigh 17.0592g AAm (8mol / L) and 0.0351g KA (0.008mol / L) respectively into the mixed solution of step 1), stir in a water bath at 60°C for 30 minutes under the condition of avoiding light, and prepare A mixed solution of 150 mg / mL of Amy, 3 wt % of PVA and 8 mol / L of AAm was obtained.

[0038] Step 3): inject the mixed solution obtained in step 2) into a glass mold under light-shielding conditions, and place it under an ultraviolet light at 20 cm for 5-7 hours to obtain a pre-polymerized Amy hydrogen-bonded cross-linked PAAm hydrogel.

[0039] Step 4): The pre-polymerized hydrogel obtained in step 3) was frozen in a refrigerator at -20°C for 20 hours, and then thawed at 25°C for 4 hours to obtain a high-strength, high-adhesion Amy composite PAAm...

Embodiment 3

[0043] Step 1): Weigh 3.0000g of Amy (100mg / mL) and 1.2766g of PVA (4wt%) into a three-necked flask, then add 30mL of deionized water, and stir in a water bath at 100°C for 2.0 hours to obtain a uniform mixed solution.

[0044] Step 2): Weigh 21.3240g AAm (10mol / L) and 0.0438g KA (0.010mol / L) respectively into the mixed solution of step 1), stir in a water bath at 60°C for 30 minutes under the condition of avoiding light, and prepare A mixed solution of 100 mg / mL of Amy, 4 wt % of PVA and 10 mol / L of AAm was prepared.

[0045] Step 3): inject the mixed solution obtained in step 2) into a glass mold under light-shielding conditions, and place it under an ultraviolet light at 20 cm for 5-7 hours to obtain a pre-polymerized Amy hydrogen-bonded cross-linked PAAm hydrogel.

[0046] Step 4): The pre-polymerized hydrogel obtained in step 3) was frozen in a refrigerator at -20°C for 20 hours, and then thawed at 25°C for 4 hours to obtain a high-strength, high-adhesion Amy composite PA...

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Abstract

The invention discloses a preparation method of a high-strength and high-adhesion branched starch composite polyacrylamide/ polyvinyl alcohol hydrogel with a strong hydrogen bonding effect, the methodcomprises the following steps: branched starch, polyvinyl alcohol, polymer monomer acrylamide and a photoinitiator are dissolved to obtain a uniform mixed solution, firstly, the uniform mixed solution is initiated under the condition of ultraviolet light, so that the acrylamide is polymerized, micro-crystals are formed in a polyvinyl alcohol network in the freezing and unfreezing process, a multi-hydrogen bond interaction can be formed between molecular chains of the branched starch and molecular chains of the polyacrylamide and molecular chains of the polyvinyl alcohol, and under the doubleactions of multiple hydrogen bonds and the micro-crystals, multi-physical-bond cooperative cross-linking is realized. The preparation process is simple and convenient to operate, and the prepared hydrogel has relatively high mechanical strength and excellent adhesion property on the surface of glass, and can be used as a preferred material of a soft robot.

Description

technical field [0001] The invention belongs to polymer materials, in particular to a preparation method of high-strength and high-adhesion hydrogel. Background technique [0002] Hydrogel is a special polymer material. It is a three-dimensional network composed of hydrophilic polymers, which can swell in water and keep a large amount of water from being dissolved. The soft and wet hydrogel has a good tissue phase. Capacitance has become a popular polymer material for human tissue regeneration applications, and has broad application prospects in soft robotics and tissue engineering. Strong adhesion between hydrogels and solid materials such as metals, glasses, ceramics, and silicones is a must for widespread applications in biomedicine and soft electronics. However, the surface of general high-strength hydrogels is smooth, and the adhesion of hydrogels is weak, which cannot meet the requirements of use. Therefore, the research has been further extended to design hydrogels ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L33/26C08L29/04C08L3/12C08F120/56C08F2/48
Inventor 李学锋张奕坤黄以万彭雪银肖龙亚黎勋
Owner HUBEI UNIV OF TECH
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