Degradation kinetics of resole-modified epoxy .1.

摘要

Blends of resole with epoxy resin (General Purpose) having different weight ratios (0/100, 25/75, 50/50, 75/25, and 100/0) based on physical mixing have been prepared. These blends were cured by adding polyamide in a 60:40 ratio based on blend resins and polyamide. The degradation kinetics of these resins was studied by dynamic thermogravimetric analysis in nitrogen atmosphere at a heating rate of 15 degrees C/min by using the Coats-Redfern equation. It is concluded that the degradation of each sample follows first-order (n = 1) degradation kinetics. This is obtained on the basis of best fit analysis, and all the parameters are confirmed by regression analysis. From the reaction order value, activation energy (E) and preexponential factor (Z) were calculated by the slope and intercept of the plot between X and Y, respectively.