Abstract: Quartz fiber cloth/J-284PD cyanate ester resin composites were prepared by hot-pressing tank forming method, and their mechanical properties,dielectric properties and moisture-heat resistance were verified. The results show that quartz fiber cloth/J-284PD cured at medium temperature composites materials have excellent mechanical, dielectric properties and moisture-heat resistance. Among them, the tensile strength is 630 MPa, the interlaminar shear strength is 58.8 MPa, the dielectric constant is 3.1, and the dielectric loss is 0.003. After 10 days of moisture-heat test, the maximum performance decline is only 10%.

Key words: cyanate ester, composites, mechanical properties, dielectric properties