Cyanate Ester– Epoxy Blends toward Microwave Transparent Polymer Composites through Resin Film Infusion for Wideband Electromagnetic Applications

Abstract

Cyanate Ester–Epoxy blends and their glass–fabric reinforced composites with improved thermal, mechanical, and dielectric characteristics were developed through cost-effective out-of-autoclave process, resin film infusion. They are thermally stable at least up to 320°C with glass transition temperature up to 195°C. They have excellent structural characteristics in comparison to their pristine counterparts, and their crosslinking was validated with Fourier transform infrared. Electromagnetic properties such as ε’ (2.8–3.0), ε” (0.02–0.14), tan δ (0.008–0.051), and transmission loss of <−1.5 dB makes them ideal materials for electromagnetic transparent composites and for encapsulating applications for wideband microwave frequencies.