Study on the properties of liquid crystal polyarylate fiber reinforced cyanate resin composites

Resin-based wave-transparent composites are developing toward light weight and low dielectricity. In this paper, Liquid Crystal Polyarylate Fibers fabrics (LCPF) with lower dielectric constant and lower density are used instead of traditional glass fibers as reinforcement materials for wave-transparent composites. In order to improve the mechanical properties of LCPF reinforced cyanate composites, the surface modification of LCPF was carried out by plasma process, and the effect law of plasma process on the chemical composition, microscopic morphology and mechanical properties of LCPF surface was analyzed, and the interlayer shear strength of LCPF/CE composites was increased by 44%, and the interlayer shear strength was 28 MPa. The dielectric constant of the modified LCPF composites at 10 GHz is 3.0 and the loss angle tangent is 0.005, which has excellent dielectric properties. The tensile strength is 510MPa at room temperature and 347MPa at 135℃, and the porosity is only 0.4%, which has good comprehensive mechanical properties. As a new wave-transparent composite material, it has broad application prospects in the fields of aircraft, missiles, satellites, sea-based and land-based radar radomes, and high-performance printed circuit boards, etc.