Preparation method of polymer grafted nanoparticle composite hydrogel based on hydrogen bonds

Abstract

The invention belongs to the technical field of high polymer materials, and relates to a hydrogen bond-based polymer grafted nanoparticle composite hydrogel preparation method, which comprises: carrying out an amidation reaction on 3-aminopropyltriethoxysilane and 2-bromoisobutyryl bromide, and carrying out a hydrolysis reaction with silicon dioxide nanoparticles to obtain initiator particles; performing a surface-initiated atom transfer radical polymerization reaction on the initiator particles and a polymeric monomer, and then performing a hydrolysis reaction with trifluoroacetic acid to obtain polymer grafted nanoparticles; wherein the polymeric monomer comprises one or a combination of two of polyethylene glycol methyl ether methacrylate and tert-butyl acrylate; and carrying out photo-initiation polymerization reaction on the polymer grafted nanoparticles and the hydrogel precursor solution to obtain the composite hydrogel. Compared with the prior art, the energy storage modulus, the loss modulus, the elongation at break and the fracture toughness of the prepared nano-composite hydrogel are remarkably improved, and the nano-composite hydrogel has a good application prospect.

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