Abstract: Cyanate ester foam(CEF) was prepared via molding foaming with bisphenol A cyanate ester resin (BADCy) as the main material.The chemical structure, cell structure, thermal behavior, and mechanical property of the foam were studied. It showed that CEF could be fully-cured under 155 ℃/2 h+200 ℃/2 h. Closed cells were uniformly distributed.Glass transition temperature (Tg) of the CEF was 263 ℃, and 5 % weight loss temperature was 344 ℃,which revealed an excellent thermal stability.CEF had excellent mechanical properties, and the compressive modulus and compressive strength had a linear relationship with ρ1.043 and ρ2.204.

Key words: cyanate ester, foam, cell, thermal property, mechanical property