Table of Contents
ISRN Polymer Science
Volume 2012 (2012), Article ID 309861, 8 pages
http://dx.doi.org/10.5402/2012/309861
Research Article

Cure Kinetics and Activation Energy Studies of Modified Bismaleimide Resins

1Research and Development, Department of Mechanical Engineering, R. V. College of Engineering, Bangalore 560 059, India
2Department of Polymer Science, University of Mysore, Karnataka 570005, India

Received 11 December 2011; Accepted 11 January 2012

Academic Editors: A. Buzarovska and A. Mousa

Copyright © 2012 M. Satheesh Chandran et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The cure kinetics and activation energy (Ea) of bismaleimide homopolymer and modified bismaleimide resin systems with different chain extenders were investigated. The bismaleimide resin under investigation was bismaleimidodiphenyl methane (BMPM) and the chain extenders were (i) O-O′ diallyl bisphenol A (DABA) and (ii) methylenedianiline (MDA). Dynamic multiheating DSC method was used to study the kinetics of the curing process. Activation energies were determined for both unmodified and modified resins from nonisothermal multiheating rate DSC tests by using Ozawa and Kissinger models. Activation energy for BMPM homopolymer increased from 95 kJ/mol to 125 kJ/mol as a function of conversion. For the MDA-modified system the activation energy was independent of percentage conversion, at 108 kJ/mol. In the case of DABA-modified bismaleimide the activation energy increased steadily at 6 kJ/mol from 10 to 100% conversion.