Preparation method of self-repairing hydrogel

Abstract

The invention discloses a preparation method of self-repairing hydrogel. The preparation method comprises the following steps: S1, preparing a water solution of an alkalinity regulator as shown in a formula 1; S2, adding a hydroxyl supplier as shown in a formula 2 into the water solution of an alkalinity regulator, adding a photoinitiator and boric acid, and fully carrying out dissolving to obtaina mixed solution; S3, removing air in the mixed solution in a vacuum environment, and carrying out bubbling with inert gas to obtain a reaction solution; and S4, placing the reaction solution under ultraviolet light or under a heating condition to carry out a random copolymerization reaction to obtain the self-repairing hydrogel. According to the preparation method, the alkalinity regulator can be used to adjust the pH value, and can be subjected to the random copolymerization reaction with the hydroxyl supplier with a specific structure through carbon-carbon double bonds; and then a reactionis carried out with borate radicals in the boric acid to form dynamic reversible cross-linking, so that the self-repairing hydrogel obtained by the method can achieve self-repairing performance undera room temperature condition without external stimulation. In addition, the preparation method is simple.

Description

technical field [0001] The invention belongs to the technical field of preparation of functional materials, and specifically relates to a preparation method of self-repairing hydrogel. Background technique [0002] Smart hydrogels that are responsive to external stimuli have attracted extensive attention from many researchers. They can significantly reduce the adverse effects of material consumption and environmental pollution, and have gradually become a research hotspot in the field of new soft materials. The tunability of smart hydrogels makes them promising for applications in the fields of sensors, actuators, drug delivery, tissue engineering, and medical engineering. Due to its potential application value, scientists have proposed various strategies to prepare various smart gel systems. A commonly used method is to use non-covalent bond interactions, but the bond energy of non-covalent bonds is low, and the gel formed by non-covalent bond interactions is unstable and ...

AI Technical Summary

Problems solved by technology

[0004] Although there are many preparation methods for self-healing hydrogels, the following problems generally exist in the existing preparation methods: when preparing self-healing hydrogels based on boron ester bonds, boric acid and boric acid and 1,2- or Borate ester bonds are formed between 1,3-diols, and polyvinyl alcohol is usually used, but boric acid is very sensitive to polyvinyl alcohol, and it gels quickly after contact, and the formed hydrogel has low mechanical strength (<0.12MPa) ; or other monomers containing hydroxyl groups are grafted by grafting to form polymers containing hydroxyl groups in the side chains. It is often necessary to introduce functional groups at the end groups or side chains of the polymers. This process is more complicated and the steps cumbersome

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