Preparation And Properties Of Multi-responsive Self-healing Hydrogel

Intelligentization is the development trend of the future technology,and the realization of intelligentization depends on smart materials.Self-healing hydrogels are a class of smart materials that can automatically repair and restore the original function after damage.As a kind of smart hydrogels,multi-responsive self-healing hydrogels can realize versatile integration,and become an important research direction now.In this paper,multi-responsive self-healing hydrogels were synthesized by one-pot method via free radical polymerization,using different monomers and crosslinking agents.The responsiveness of different hydrogels were studied.The main contents are as follows:1.The monomers containing phenylboronic acid group and catechol group,and the crosslinker containing disulfide bonds were synthesized.Multi-responsive self-healing hydrogels were prepared by copolymerization of the monomer dimethylaminoethyl methacrylate(DMAEMA)with the three compounds synthesized above.Since containing PDMAEMA,the hydrogels were responsive to pH and temperature.The disulfide bonds can be broken by dithiothreitol(DTT),and the hydrogels exhibited DTT response.The boronic esters in hydrogels were formed by the reaction of the phenylboronic acid group and catechol group,and presented the responsiveness to pH and glucose.In addition,the hydrogels showed excellent self-healing ability due to the well-known dynamic covalent bond of boronic esters.2.The multi-responsive self-healing hydrogels were prepared by the copolymerization of the DMAEMA,?-cyclodextrin(?-CD)and gold nanoparticles(Au NPs).The pH response and temperature response of the hydrogels were studied.The hydrogels showed excellent selfhealing ability due to the host-guest interaction between the ?-CD and dimethylamino groups.Because of the incorporation of the Au NPs,the hydrogels showed good catalytic performance.