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Journal of Reinforced Plastics and Composites
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Study of the Effect of BDMA Catalyst in Epoxy Novolac Curing Process by Isothermal DSC

M. R. Firouzmanesh

Amir Kabir University of Technology, Department of Polymer Engineering, P.O. Box 15875/4413, Tehran, Iranf7332967{at}aku.ac.ir

A. Aref Azar

Amir Kabir University of Technology, Department of Polymer Engineering, P.O. Box 15875/4413, Tehran, Iran

Epoxy-Novolac/Anhsydride cure kinetics have been studied by differential scanning calorimetry under isothermal conditions.

The system used in this study was Epoxy Novolac resin (DEN431), nadic methyl anhydride as hardener and benzyl dimethyl amine as accelerator. Kinetic parameters including the reaction order, activation energy and kinetic rate constants were investigated. The cure reaction was described with the catalyst concentration and the normalized kinetic model was developed for it. It is shown that, the cure reaction was dependent on the cure temperature and catalyst concentration and proceeded through an autocatalytic kinetic mechanism. The curing kinetic constants and the cure activation energies were obtained by the Arrhenius kinetic model. The suggested kinetic model with a diffusion term was successfully used to describe and predict the cure kinetic of Epoxy Novolac resin compositions as a function of the catalyst content and temperature.

Key Words: epoxy novolac resin • nadic methyl anhydride • benzyl dimethyl amine • cure • kinetic • isothermal DSC

Journal of Reinforced Plastics and Composites, Vol. 24, No. 4, 345-353 (2005)
DOI: 10.1177/0731684405033953
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