Preparation method of novel polymer-based multilayer shape memory material

Abstract

The invention discloses a preparation method of a novel polymer-based multilayer shape memory material. The multilayer shape memory material prepared through the preparation method is formed by a polymer-based fixed phase layer and a polymer-based revertible phase layer, and has a two phase alternate multilayer bicontinuous structure, wherein the polymer-based fixed phase layer is a polymer having rubber elasticity at room temperature, and the polymer-based revertible phase layer is a polymer having obvious melt transition or glass transition in the heating process. The multilayer material deforms at a melting point or a glass transition temperature or above, then is cooled to room temperature in order to obtain a temporary shape, and then is heated to the melting point or the glass transition temperature or above in order to recover to an initial shape. The polymer-based multilayer shape memory material prepared through the preparation method has the advantages of controllable layer quantity, layer thickness and layer structure, adjustable raw material formula, excellent shape memory performance, commercial raw materials, and low production cost; and the preparation method has the advantages of simplicity, high production efficiency, and realization of continuous batch production.

Description

technical field [0001] The invention relates to the field of processing and manufacturing of polymer materials, in particular to a preparation method of a novel polymer-based multilayer shape memory material. Background technique [0002] As a branch of intelligent materials, shape memory materials refer to the stimuli that can respond to changes in the external environment (such as temperature, electromagnetic field, pH value, light and humidity, etc.), by changing their physical or chemical properties from a temporary shape to the original design. A class of materials with a defined shape. The development of shape memory materials can be mainly divided into three categories, namely shape memory alloys, shape memory ceramics and shape memory polymers. Among them, shape memory polymers are widely used in many fields such as medical equipment, packaging, sensors, and aerospace due to their advantages such as light weight, low consumption, easy processing, excellent shape mem...

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Problems solved by technology

However, these traditional methods have various shortcomings such as complex preparation process, low production efficiency, and difficult characterization.

[0005] In recent years, blending elastomers and crystalline polymers to prepare blended shape memory polymers can solve most of the shortcomings of traditional preparation methods, but blended shape memory polymers can only exhibit bicontinuous structures in the system. , that is, the excellent shape memory performance can only be exhibited when the component phase continuity is high

However, the phase morphology of the blend is limited by the viscosity ratio, component ratio, and compatibility of the two phases. Therefore, the preparation of shape memory polymers by blending needs to consider and balance multiple factors, and usually requires a thorough understanding of the blending process. The final product can only be obtained by secondary compression molding, which prolongs the production cycle, so there are certain production shortcomings

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