Method for preparing liquid crystal elastomer intelligent material with three-dimensional reversible drive

Abstract

The invention discloses a method for preparing a liquid crystal elastomer intelligent material with three-dimensional reversible drive. A dynamic covalent bond is introduced into a liquid crystal elastomer, the liquid crystal elastomer is converted into a three-dimensional structure by using an external force, and an exchange reaction in a system is activated under external stimulation (such as light and heat), so that liquid crystal element orientation caused by external force deformation is fixed, and the liquid crystal elastomer reversibly changes between a three-dimensional shape and a film. According to the method, the liquid crystal elastomer can have three-dimensional reversible drive without a catalyst, liquid crystal element orientation through stretching or overall orientation ofthe liquid crystal element.

Description

technical field [0001] The invention relates to the field of polymer material processing, in particular to a preparation method of a novel liquid crystal elastomer intelligent material with three-dimensional reversible drive. Background technique [0002] Liquid crystal elastomer (LCE) refers to a non-crosslinked liquid crystal polymer that is moderately crosslinked and exhibits elasticity in an isotropic state or a liquid crystal state. Liquid crystal elastomers are a class of smart materials that combine liquid crystal order and rubber elasticity. Under external stimuli such as light, heat, electricity, and magnetism, when a reversible phase transition occurs between the liquid crystal phase and the isotropic phase, the mesogen The ordered / disordered reversible arrangement drives the polymer chain segment to move, which causes the liquid crystal elastomer to produce a large macroscopic reversible deformation. As drivers and sensors, liquid crystal elastomers have broad ap...

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Problems solved by technology

There is a main problem in this method, that is, the single domain is easy to disappear due to the rapid exchange reaction catalyzed by the catalyst after the material is deformed at high temperature and multiple times; another disadvantage is that the degree of orientation caused by external stretching is limited (stretching When the material is too long, it is easy to break, and when the stretching is not long enough, the mesogen is not enough to be fully oriented, and the contradiction between the two makes the degree of orientation limited), and cannot produce a large enough reversible deformation

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