A method for preparing precise polymer networks

Abstract

The invention discloses a method for preparing an accurate polymer network. The number of azide functional groups at the tail end of a polymer is controlled accurately by using a method combining reversible addition-fragmentation chain transfer (RAFT) and click chemistry, so that the number of crosslinking points is controlled and a regular polymer cross-linked network structure is prepared. In the method disclosed by the invention, gel in the polymer network is generated by performing a click reaction on two or more accurately-controlled functional end group azide or alkyne functional groups (E) at the tail end of a polymer chain and two or more end alkynyl or azide functional groups (E) via multiple steps of RAFT. The method has the advantages of accurate controllability of the number of crosslinking points and density of a polymer cross-linked network structure and suitability for various polymer network structures containing different functional groups.

Description

technical field

[0001] The invention belongs to the field of functional macromolecules, and relates to a method for preparing a precise polymer network structure by controlling the number of polymer terminal functional groups based on molecular design. Background technique

[0002] Polymer network structures, especially hydrogels, are materials that have the most similar properties and performances to biological tissues. Hydrogel is a polymer network formed by the cross-linking of hydrophilic polymers. In the gaps of the polymer network, some small molecular substances can move like in biological membranes to transmit information and substances. Polymer networks with high strength and precise molecular structure and function have important application prospects in bionic organs with membrane functions, such as artificial blood vessels, kidneys, and skin, due to their biomembrane-like functions. Therefore, high-strength functional hydrogels will play a pivotal role in the fu...