Preparation method of self-healing hydrogel

Abstract

The invention discloses a preparation method of a self-repairing hydrogel, comprising the steps of: S1, preparing an aqueous solution of an alkalinity regulator shown in formula 1; S2, adding the alkalinity regulator shown in formula 2 to the aqueous solution The hydroxyl donor, photoinitiator and boric acid body are fully dissolved to obtain a mixed solution; S3, remove the air in the mixed solution in a vacuum environment, and perform inert gas bubbling to obtain a reaction solution; S4, place the reaction solution in The self-healing hydrogel is obtained by performing random copolymerization reaction under ultraviolet light irradiation or under heating conditions. The alkalinity regulator of the preparation method can not only adjust the pH, but also carry out random copolymerization reaction with the hydroxyl donor with a specific structure through the carbon-carbon double bond, and then react with the borate radical in the borate body to form a dynamic reversible crosslinking. The obtained self-healing hydrogel realizes self-living and self-healing performance under room temperature without external stimulation; and 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 ...

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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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