Preparation method of shape memory composite material

Abstract

The invention belongs to the technical field of shape memory materials, and relates to a preparation method of a shape memory composite material applied to the aerospace field. The shape memory composite material is obtained by compounding discontinuous orientation fibers and shape memory thermoplastic or thermoset resin substrates; the fibers are in a height orientation state in the composite material and the mechanical property and the retention rate of the fibers are higher than the mechanical property and the retention rate of a continuous fiber reinforced composite material; meanwhile, the fibers are discontinuous, and the average length of the fibers and the volume fraction of the fibers can be adjusted, so that the failure strain of the material reaching more than the shape memory transformation temperature can be improved through collaborative optimization, the relatively high deformation property and high folding rate are achieved, and the shape fixed rate is improved at the same time. According to the preparation method, the comprehensive optimization of the mechanical performance and the shape memory performance of the shape memory composite material can be realized, and the preparation method has wide application potential in the application field of aerospace shape memory composite materials.

Description

technical field [0001] The invention belongs to the technical field of shape-memory materials, and relates to a method for preparing a shape-memory composite material for application in the aerospace field. Background technique [0002] In the field of aviation, the development of intelligent deformation technology has become an important trend in the intelligent design of aircraft structure and function. The shape memory effect can be used to freely change the configuration of the aircraft, such as the shape of the wing, expand the traditional mission field of the aircraft, and improve the aircraft's performance. Comprehensive performance. In the field of aerospace, due to the limitation of the launch size of spacecraft and the difficulty of assembly and construction in outer space, large structures such as space deployable solar sails, trusses, and antennas must be folded before launch, and when they reach the predetermined orbit, they can be reliably deployed. working st...

AI Technical Summary

Problems solved by technology

However, the strength and stiffness of polymers are low, and they can only be used in self-healing materials, medical and other fields that do not require high mechanical properties.

The shape memory composite material obtained by adding disordered short fibers and particle reinforcement materials to the polymer inherits the excellent shape memory properties of shape memory polymers, but its mechanical properties are still low and cannot be used in the aerospace field.

The overall stiffness of the continuous fiber reinforced shape memory composite material is relatively large, and the failure strain is small above the shape memory transition temperature of the material, resulting in poor deformation ability of the material, low folding efficiency, and low shape retention rate. The need for large deformations