Photoinduced shape memory high polymer based on host and guest actions and preparation method thereof

Abstract

The invention discloses a shape memory high polymer material using optically controlled host and guest actions as controllable crosslinking / decrosslinking functional groups and a preparation method thereof. In the structural design, the host and guest functional monomers are simultaneously modified to the high polymer base material, wherein cyclodextrin is used as the host molecule, and azobenzene is used as the guest molecule. When the azobenzene exists in a trans structure, the azobenzene generates molecule identification with cyclodextrin to form a stable inclusion compound under the mutual actions of the host and guest, thereby obtaining a crosslinked structure. At this time, external force is applied to the high polymer material under high-temperature conditions to form, thereby obtaining a temporary shape. When being irradiated by a 350nm-below wavelength light source, the azobenzene is converted from a trans structure into a cis structure, the cis azobenzene and cyclodextrin can not generate the molecule identification action, the host and guest actions are destroyed, and the inclusion compound is disassembled, thereby obtaining a decrosslinked structure. At this time, the shape of the material recovers to the initial shape, thereby implementing the shape memory function of the material.

Description

technical field [0001] The invention relates to a photoinduced shape memory polymer material and a preparation method thereof, belonging to the field of intelligent polymer materials. Background technique [0002] Shape memory polymer material is an important smart material. Compared with other types of shape memory materials, it has the advantages of good flexibility, light weight, low price and easy processing. It is used in biomedical materials, aerospace materials, smart devices, etc. Materials, optoelectronic information materials and other fields have important application prospects, so they are widely concerned by researchers. Shape memory polymer materials refer to polymer materials that can respond to external stimuli, adjust the shape of the material, and quickly return to the pre-designed shape. According to the different response modes, the shape memory polymer materials are thermotropic, phototropic, acid-base, magnetotropic, electrotropic and other types. [...

AI Technical Summary

Problems solved by technology

This kind of material can realize remote control, but it will still generate heat in the material system, which is restricted when used in a constant temperature system. At the same time, due to the heat generated by light, the heat is conducted in the material, and fixed-point control cannot be realized.