The development demand for lightweight and low dielectric properties of resin based wave-transparent composite materials. This article replaces traditional glass fibers with PBO fibers with lower dielectric constant and lower density as the reinforcement material for wave transmitting composite materials. To improve the mechanical properties of PBO reinforced cyanate ester composite materials, a plasma process was used to modify the surface of PBO fiber fabric. The influence of plasma process on the surface chemical composition, microstructure, and mechanical properties of PBO fiber was analyzed. The interlayer shear strength of PBO/CE composite materials was increased by 45%, and the interlayer shear strength was 29.8 MPa. The modified fiber composite material has a dielectric constant of 3.3 and a loss tangent of 0.005 at 10GHz, exhibiting excellent dielectric properties. The tensile strength at room temperature of the composite material is 591MPa, and the bending strength is 336MPa, indicating good comprehensive mechanical properties. As a new type of transparent composite material, it has broad application prospects in fields such as aircraft, missiles, satellites, sea-based and land-based radar radomes, as well as high-performance printed circuit boards.
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.
Laser scribing graphene (LSG) has provided a facile and effective strategy for graphene formation via direct laser scribing on polymer substrates. The outstanding properties make it highly impending to be a key building block for highperformance composites to realize multifunctional applications. Aiming to facilitate the integration of LSG with composites, here we report a novel process for LSG production by using cyanate ester-based composites (CEC) as the precursor. Systematic characterization, test and evaluation were performed to explore the processing-structure-property relationship of CEC-based LSG. It was found that CEC-based LSG possessed a better conductivity (785Ω/sq), which is attributed to the high degree of laser graphitization. The resulting LSG promises CEC broader capabilities. We demonstrated the LSG-based composites did well in in-situ curing process monitoring and liquid sensing applications. With straightforward manufacturing process and excellent working performance, the expanding applications of LSG composites are foreseen.
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