Study On Preparation And Electrical Properties Of Carbon Fiber Reinforced Polyetheretherketone Composite

In various fields such as aerospace,automobile industry,biomedicine and wind energy,the requirements for the "light and strong" performance of materials are getting higher and higher.Traditional fiber-reinforced thermoset composite materials can no longer meet the existing requirements,so the research and development of fiber-reinforced thermoplastic composites has become a research hotspot.Among them,polyether ether ketone is a representative of a new generation of thermoplastic polymers with excellent properties such as high strength,high temperature resistance and corrosion resistance.Carbon fiber reinforced polyether ether ketone composite materials have become one of the ideal materials in aerospace and other fields.However,due to the high melting point of polyether ether ketone and the high viscosity after melting,it is difficult to infiltrate the carbon fiber tow,which makes the preparation process of carbon fiber reinforced polyether ether ketone composite material difficult and hinders its wide application.The current research is mainly about the preparation and mechanical properties of carbon fiber reinforced polyether ether ketone composites,and there is little research on its electrical properties.This dissertation takes carbon fiber reinforced polyether ether ketone composite material as the research object,and aims to improve the fiber wettability of polyether ether ketone and the electrical properties of the composite material.The main research content includes the following aspects:(1)In order to solve the problem of the poor wettability of the thermoplastic resin to the fiber,by thinning the carbon fiber tow,a set of widening system combining the mechanical widening method and the pneumatic widening method was designed and developed,and a film spreading method was adopted.The stacking method realizes the prepregs of carbon fiber and resin,and successfully developed an integrated experimental platform of carbon fiber widening and prepregs.Then,by testing the mechanical properties of unidirectional belts of different widths,the uniformity and damage degree of the fiber arrangement in the unidirectional belts prepared by this experimental platform are discussed.(2)Aiming at the preparation process of carbon fiber reinforced polyether ether ketone composite material,this paper has determined its molding process parameters through theory and a large number of experiments.The thinning of the fiber helps to increase the infiltration effect of the polyether ether ketone polymer on the fiber tow,improve the permeability of the polymer to the fiber,and significantly reduce the resin enrichment area inside the composite material,making the distribution of fibers and polymers more uniform.(3)In view of the problem that fiber thinning is beneficial to improve the conductivity of carbon fiber composites materials,Especially in the thickness direction,the conductivity test and carrier migration of carbon fiber reinforced polyether ether ketone composites materials from two different thicknesses of prepregs are tested,to explore its conductive mechanism.(4)Ultra-thin carbon fiber reinforced polyether ether ketone composite material is used to prepare carbon fiber reinforced polyether ether ketone composite conductive yarns with different twists,and then a test platform is built to study its sensing performance.The research results show that when the twist is 30 twists/10 cm,the sensing effect is the best.