Shape memory polymer composite and preparation method thereof

Abstract

The invention relates to a shape memory polymer composite and a preparation method thereof. The composite is mainly prepared from random copolymer elastomer and small organic molecular crystal substances, and can also be prepared from other auxiliaries. Shape memory thin films, sheets, fiber and other products are directly obtained by sufficiently blending raw materials through a double-screw extruder. Random copolymer elastomer has good entropy elasticity and plays a role in restoring the original shape of the composite. Small organic molecule substances play a role in fixing and releasing the temporary shape of the composite through crystallization and fusion transformation. Random copolymer elastomer and small organic molecular crystal substances are used in cooperation for making the composite have excellent shape memory performance. Raw materials are common, easy to obtain and low in price. The double-screw extrusion method is a continuous preparation process, one-step preparation from raw materials to shape memory products is achieved, efficiency is high, the product stability is good, no solvent is used, and environment friendliness is achieved. Cost of shape memory polymer materials is powerfully reduced, and the preparation efficiency of shape memory polymer materials is remarkably improved.

Description

technical field [0001] The invention relates to the field of shape-memory materials, in particular to a shape-memory polymer composite material with a random copolymer elastomer as a matrix and a preparation method thereof. Background technique [0002] Shape memory polymer materials are a class of smart materials that can respond to external conditions. They can "memorize" a set shape (original shape), and then be molded into various desired shapes (temporary shapes). They can automatically return to their original shape when certain conditions are met in temperature, magnetic field, humidity, light, etc. Shape memory polymer materials have many advantages such as easy shaping, softness, large deformation, adjustable response conditions, various trigger methods, printable, light weight, and low cost. Repair and other fields have broad application prospects. Traditional temperature-responsive shape memory polymer materials are mainly copolymer materials with soft segment a...

AI Technical Summary

Problems solved by technology

The invention reduces the production cost of materials, but the polymers with multi-block structure are relatively limited, and a large amount of organic solvents need to be used in the solution blending preparation process, and the solvent must be evaporated to dryness after mixing, which pollutes the environment

In addition, whether it is solution blending, soaking, or kneading in the patent, the obtained mixture must go through secondary molding processes such as compression molding before it can be used. Therefore, it is a batch preparation process with low preparation efficiency and cannot be used continuously. The problem