1 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China 2 Shenzhen Keruiwo Technology Co., Ltd., Shenzhen 518117, Guangdong, China
Abstract: Cross-linked polystyrene has an extremely low dielectric constant and dielectric loss, and is regarded as the preferred application material in the field ofhigh-frequency communication. With the increase in the size of communication equipment, the mechanical properties of cross-linked polystyrene cannot meet the requirements of large-sized workpieces. In this study, fiber-reinforced composite were fabricated via the pouring method, integrating polypropylene fibers with cross-linked polystyrene. The dielectric properties, mechanical performance, and fracture morphology of the composites were comprehensively examined under different fiber contents and lengths. A resonator, a universal testing machine, and scanning electron microscopy were employed for these investigations. At 5.0 GHz, the dielectric constant of the composites dropped from 2.52 (the dielectric constant of cross-linked polystyrene) to 2.45, with a dielectric loss value of 0.001. Compared to pure cross-linked polystyrene, the composite material exhibited remarkable improvements: a 36.2% increase in flexural strength, a 67.7% boost in tensile strength, and a storage modulus reaching 1 756 MPa (46.3% higher than that of the original cross-linked polystyrene). Evidently, the addition of polypropylene fibers significantly enhances the mechanical properties of cross-linked polystyrene.
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2026, Vol. 40 
