Abstract: Dewaxing of quartz fiber weave was done by surface treatment at high temperature, and quartz/cyanate ester prepregs as well as the composites were produced. Properties of prepregs and composites, with and without dewaxing, were compared. It was found that the processability of prepregs was improved by dewaxing, the composites′ dielectric properties remained the same, and the mechanical properties were improved significantly with flexural strength increased by 31% and interlaminar shear strength increased by 16%. The interface adhesion of composites was improved by dewaxing of quartz fibers.

Key words: dewaxing, quartz fiber, cyanate ester, dielectric, mechanical properties