Shape memory intrinsic type self-repairing material as well as preparation method and application thereof

Abstract

The invention provides a shape memory intrinsic type self-repairing material which is prepared from the following components: a crystal polyether or polyester diol monomer, a diisocyanate monomer, a monomer containing a dynamic covalent bond micromolecule chain extender, a rubber elastic body, a free radical polymeric ultraviolet light initiator, a multi-sulfydryl curing agent and conductive packing. If the shape memory intrinsic type self-repairing material is suffered from mechanical damage, a conductive path consisting of internal conductive packing is damaged, the resistance of the material is increased, under the action of external current, temperature rise can be resulted from the Joule heating effect of the material self, a reversible shape memory effect of the material can be excited, cracks of the material can be shrunk and closed, meanwhile after macroscopic cracking closure, the dynamic covalent bonds inside the material can recombine the material as molecular chains of a fracture surface are diffused with one another and subjected to reversible chemical reaction, at the moment, paths of the conductive packing in the material can be recovered, the resistance of the material can be reduced to an original level, the Joule heating effect can be eliminated, the temperature can be reduced to the room temperature, and the self-repairing process has the characteristics of reversibility and repeatability.

Description

technical field [0001] The invention relates to the field of intelligent polymer materials, and more specifically relates to an intrinsic self-healing composite material with shape memory and its preparation method and application. Background technique [0002] During the processing and use of polymer materials, cracks and local damage will inevitably occur inside them. Therefore, the synthesis of polymers and polymer composites with biomimetic self-healing functions has become an emerging research field. The core of self-repair is energy supply and material supply, imitating the principle of biological damage healing, so that composite materials can self-repair internal and external damage, thereby eliminating hidden dangers, enhancing the mechanical strength of materials, and prolonging service life. Industry, aerospace, electronics, bionics and other fields are particularly important. At present, self-healing materials can be divided into two categories: explant type and...

AI Technical Summary

Problems solved by technology

However, these two types of self-repair methods have their own limitations. The explanted repair method uses microcapsules and hollow fibers to encapsulate the repair agent, so there is a problem of exhaustion of the repair agent; in contrast, the intrinsic self-repair method Repair mostly relies on the reversible chemical reaction of its own chemical bonds (covalent bonds, non-covalent bonds) to achieve repeated repairs to material microcracks, but requires that the two fractured surfaces generated by material fractures be close enough to interact to repair the matrix

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