Shape memory polyurethane with high-temperature restorability

Abstract

The invention relates to a shape memory polyurethane material with high-temperature restorability, which is characterized in that irradiation-activated carbon fibers are added as a reinforcer to synthesize the polyurethane shape memory material with high-temperature restorability in situ. The synthesis method comprises the following steps: (1) activating treatment of carbon fibers: activating the carbon fibers to be activated at room temperature under the irradiation of radioactive Co rays; (2) synthesis and purification treatment of hexanediol polyadipate; and (3) in-situ synthesis of shape memory polyurethane: firstly synthesizing a polyurethane prepolymer, then adding the activated carbon fibers into the prepolymer to continue the reaction, and adding a chain extender for further polymerization, thereby forming the polyurethane with shape memory function. The method can overcome the operating restrictions caused by lower glass transition temperature in the common shape memory polyurethane material, well solves the problem of poor mechanical properties, enhances the tensile strength of the shape memory polyurethane material, and widens the application range of the material.

Description

technical field [0001] The invention belongs to the field of polymer materials. Specifically relates to a shape memory polyurethane material with high temperature recovery ability. Background technique [0002] Shape memory polyurethane material is a new type of functional material with many excellent comprehensive properties. Shape memory materials refer to a new type of material that has an initial shape, and after being deformed and fixed, the external conditions can be changed by heating or other methods to restore the original shape. Since the French ORKEM company developed the first shape memory polymer (SMP) polynorbornene in 1984, the currently applied shape memory polymer materials include polynorbornene, trans 1,4-polyisoamyl Diene, styrene-butadiene, polyurethane, etc., in addition to fluorine-containing polymers, polycaprolactone, polyamide, etc. also have shape memory function. Among many materials, shape memory polyurethane has become a hot spot in SMP resea...

AI Technical Summary

Problems solved by technology

[0003] Although there are so many advantages, traditional shape-memory polyurethane materials have relatively large defects. First, their glass transition temperature is relatively low, generally below 50°C. At 40°C, some polyurethane materials begin to soften; secondly, traditional Polyurethane material is not resistant to high temperature, and it loses its shape recovery ability when it exceeds 80°C. Therefore, it is of great application value to develop a shape memory polyurethane material with high temperature recovery ability.