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Kinetic study on some cases of the curing reaction behaviour of A-B systems with A and B as isocyanate and polyol or amine and epoxide

With autokatalytic activation of A or of B; with catalytic activation of A
: Bohn, Manfred

Fraunhofer-Institut für Chemische Technologie -ICT-, Pfinztal:
Energetic materials. Past, present and future : 50th International Annual Conference of the Fraunhofer ICT, June 25-28, 2019, Convention Center, Karlsruhe, Germany
Pfinztal: Fraunhofer ICT, 2019
14 pp.
Fraunhofer-Institut für Chemische Technologie (International Annual Conference) <50, 2019, Karlsruhe>
Conference Paper
Fraunhofer ICT ()
curing of A-B systems; autocatalytic activation; catalytic activation; reaction schemes; numerical solutions of reaction rate systems

The curing of A-B systems is widespread. It appears with the formation of the elastomer binders with composite rocket propellants (CRP) or elastomer-plastic bonded high explosives (ePBX). The pairing of A and B is mostly isocyanate and polyol to form by polyaddition reaction an urethane elastomer or amine and epoxide to form an epoxide-based elastomer, also used to make duromers. The A and B react basically in a reaction of second order to form the chemical bonding between A and B. The overall reaction can be more complicated by adding a curing catalyst or a reactivity masking additive and by a type of autocatalytic activation of one of the reaction partners. But by this the bimolecular reaction between A and B is not annulled or suspended. Here the full reaction schemes for several cases are developed and the coupled differential equations are numerically integrated with some values for the reaction rate constants, chosen to elucidate the typical concentration behaviour of the involved species. Experimental following of the concentrations can be planned according to these results or methodology.