Light-curing, self-repairing and conductive hydrogel and preparation method thereof
A photocuring and chemical modification technology, which is applied in the field of photocuring self-repairing conductive hydrogel and its preparation, can solve the problems of biological safety and biological toxicity, and achieve good gel conductivity, good mechanical strength, and enhanced mechanical strength. The effect of intensity
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preparation Embodiment 1
[0046] Preparation of gelatin-based natural polymer materials with side chains containing unsaturated double bonds, ureidopyrimidinone blocks, and photoinitiating groups:
[0047] 1. Photoinitiator introduces isocyanate
[0048]
[0049] Weigh 9g of 4-hydroxybenzophenone, dissolve it in N,N-dimethylformamide, and gradually add 100mL of dimethylformamide containing 10g (60mmol) hexamethylene diisocyanate dropwise within 15min at room temperature. To the amide solution, add 5 mL of N,N-dimethylformamide solution containing 0.536 g (4.5 mmol) of N-methyldiethanolamine and 0.1 mL of dibutyltin dilaurate, and react at 80°C for 6 h. Stop heating, wait for the temperature of the reaction solution to drop to room temperature, pour the reaction solution into 500mL of n-hexane to precipitate, filter with suction, wash with n-hexane several times to obtain the product 4-(6-isocyanohexylaminocarboxy)benzophenone , weighing 8.5g.
[0050] 2. Synthesis of 2(6-isocyanohexylaminocarbonyl...
preparation Embodiment 2
[0057] Preparation of chitosan-based natural polymer materials with side chains containing unsaturated double bonds, ureidopyrimidinone blocks, and photoinitiating groups:
[0058] 1. Photoinitiator introduces isocyanate
[0059]
[0060] Weigh 9g of 4-hydroxybenzophenone, dissolve it in N,N-dimethylformamide, and gradually add 100mL of dimethylformamide containing 10g (60mmol) hexamethylene diisocyanate dropwise within 15min at room temperature. To the amide solution, add 5 mL of N,N-dimethylformamide solution containing 0.536 g (4.5 mmol) of N-methyldiethanolamine and 0.1 mL of dibutyltin dilaurate, and react at 80°C for 6 h. Stop heating, wait for the temperature of the reaction solution to drop to room temperature, pour the reaction solution into 500mL of n-hexane to precipitate, filter with suction, wash with n-hexane several times to obtain the product 4-(6-isocyanohexylaminocarboxy)benzophenone , weighing 8.5g.
[0061] 2. Synthesis of 2(6-isocyanohexylaminocarbony...
preparation example 1
[0067] The gelatin-based natural polymer material that the side chain that embodiment 1 makes contains unsaturated double bond, ureido pyrimidinone block, photoinitiating group It is formulated into an aqueous solution and mixed evenly with glycerin and lithium chloride to obtain a mixed solution. Wherein, the mass concentration of natural polymer material is 20wt%, the mass concentration of glycerin is 20wt%, and the mass concentration of lithium chloride is 5wt%. The obtained mixed solution was cured for 10 minutes with an LED-UV light curing machine, thereby obtaining a photocured self-healing conductive gelatin-based hydrogel.
[0068] After testing, the photocured self-healing conductive gelatin-based hydrogel prepared in this example was tested by a rheometer, and the storage modulus was 6750Pa, and the loss modulus was 580Pa. After the gel of this example is cut into two pieces, it can heal into a whole piece within 1 hour, reflecting good self-healing properties. Th...
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