Synthesis, cure kinetics, and thermal properties of the bis(3-allyl-2-cyanatophenyl)sulphoxide/BMI blends
A novel allyl functionalized dicyanate ester resin bearing sulfoxide linkage was synthesized. The monomer was characterized by Fourier Transform Infrared (FT-IR) Spectroscopy, 1H-, and 13C Nuclear Magnetic Resonance (NMR) spectroscopy and elemental analysis. The monomer was blended with bismaleimide (BMI) at various ratios in the absence of catalyst. The cure kinetics of one of the blends was studied using differential scanning calorimetry [nonisothermal] and the kinetic parameters like activation energy (E), pre-exponential factor (A), and the order of the reaction (n) were calculated by Coats-Redfern method and compared with those calculated using the ex perimental Borchardt-Daniels method. The thermal stability of the cured dicyanate, BMI, and the blends was studied using thermogravimetric analyzer. The initial weight loss temperature of dicyanate ester is above 380°C with char yield of about 54% at 800°C. Thermal degradation of BMI starts above 463°C with the char yield of about 68%. Inclusion of BMI in cyanate ester increases the thermal stability from 419 to 441°C.
|Keywords||BMI, Cure kinetics, Differential scanning calorimetry, Sulfoxide allyl cyanate, Thermal properties|
|Journal||Journal of Applied Polymer Science|
Anuradha, G., Sarojadevi, M., & Sundararajan, P. (2008). Synthesis, cure kinetics, and thermal properties of the bis(3-allyl-2-cyanatophenyl)sulphoxide/BMI blends. Journal of Applied Polymer Science, 110(1), 517–522. doi:10.1002/app.28638