Investigation of flexural modulus of cyanate ester/carbon fiber composite at high temperature

The advent of space exploration and high-speed civil transport has prompted the development of polymeric materials that can endure extreme environments. Cyanate esters (CEs) form a family of thermosetting resins whose performance characteristics, make them attractive competitors to many current commercial polymer materials for many advanced applications. CEs are characterized by many attractive physical, electrical, thermal and processing properties required of an ideal matrix resin. Moreover, they generally exhibit high glass transition temperature (Tg) and high flexural modulus. In this research work, bisphenol A-based cyanate ester resin was synthesized and characterized by different techniques including FT-IR, ۱H-NMR and ۱۳C-NMR. The synthesized resin was used for preparation of cyanate ester/carbon fiber composite by Hand lay-up method. The obtained composite was examined by DMTA technique to evaluate the flexural modulus in the temperature range of ۲۵-۲۵۰°C. The DMTA results showed a modulus of ۱۵.۱۳ GPa for cyanate ester/carbon fiber composite. The modulus decrease of the composite at ۲۵۰°C was approximately ۱۶%. This shows that the cyanate ester/carbon fiber composite can retain its modulus at high temperatures as high as ۲۵۰°C and so can be used for preparation of advanced composite parts especially for those working at high temperatures.

کلیدواژه ها:

High Temperature Resins ، cyanate ester ، Thermal Stability ، Mechanical Properties ، carbon composite