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Jae-Young Lee, Mi-Ja Shim, Sang-Wook Kim

The cure kinetics of CTBN-modified epoxy system

Polimery 2000, No 1, 36


DOI: dx.doi.org/10.14314/polimery.2000.036


Summary

In an epoxy system modified with a carboxyl-terminated bu­tadiene acrylonitrile copolymer (CTBN) rubber, the cure kinetics was stu­died in terms of the Kissinger equation (eqn. 1) and of the autocatalytic cure rate expression (eqn. 2). By the former equation, a simple n-th order rate equation, OSC measurements allowed to determine the activation energy and the pre-exponential factor; by the latter equation, isothermal OSC ana­lysis allowed to determine the rate constants and reaction orders. The two methods were found suitable to follow the cure kinetics of the epoxy sys­tem. In the system modified with CTBN, the cure rate was initially higher than that in the system with CTBN added, on account of the catalytic role of the -COOH groups in CTBN. At a degree of conversion equal to about 0.6, the cure rate was inverted on account of the formation of the CTBN domain.
Keywords: cure kinetics, COOH-terminated butadiene-acrylonitrile copoly­mer (CTBN), CTBN-modified epoxy system, Kissinger equation, autocatalytic cure rate expression
Jae-Young Lee, Mi-Ja Shim, Sang-Wook Kim (216.7 KB)
The cure kinetics of CTBN-modified epoxy system