Thermo-mechanical properties of carbon/phthalonitrile composite at high temperatures

Phthalonitrile resins are promising materials as matrix for advanced composites. In this work bisphenol A-based phthalonitrile resin was synthesized and characterized by different techniques including FT-IR, ۱H-NMR and ۱۳C-NMR. The synthesized resin was utilized for preparation of carbon/phthalonitrile composite by hot press method using aromatic amine as curing agent. The modulus of composite was determined by dynamic mechanical thermal analysis (DMTA) techniques in the temperature range of ۲۵-۲۵۰°C. DMTA results showed ۱۰.۵ GPa modulus for prepared carbon/phthalonitrile composite which is a high modulus for a polymer/carbon composite. Moreover, DMTA results revealed that composite samples postcured at elevated temperatures (۳۷۵°C) do not exhibit a glass transition temperature (Tg) up to ۲۵۰°C and also retain ۸۷% of their initial modulus at high temperatures as high as ۲۵۰°C. The results showed that the prepared carbon/ phthalonitrile composites can be used for preparation of advanced composite parts especially for parts which may be used at high temperatures.

کلیدواژه ها:

High Temperature Resins ، Phthalonitrile ، Thermal Stability ، Mechanical Properties ، Carbon Composite