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The kinetics and mechanism of cure of an amino-glycidyl epoxy resin by a co-anhydride as studied by FT-Raman spectroscopy

Rocks, Jens, Rintoul, Llew, Vohwinkel, Frederich, & George, Graeme A. (2004) The kinetics and mechanism of cure of an amino-glycidyl epoxy resin by a co-anhydride as studied by FT-Raman spectroscopy. Polymer, 45(20), pp. 6799-6811.

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Abstract

The thermal curing behaviour of tetraglycidyl-4,4’-diaminodiphenylmethane (TGDDM) and a co-anhydride mixture consisting of maleic anhydride (MA) and hexahydrophthalic anhydride (HHPA) was studied from 55oC to 100oC by real-time FT-Raman spectroscopy. The quantitative changes in concentrations of anhydride, epoxy, and new-formed ester were measured and empirical reaction rate curves were constructed reflecting the kinetics of the curing process. After an induction period a simple kinetic scheme that is first order in both epoxy and anhydride monomer consumption described the reaction profile until the reaction was influenced by chemo-rheological changes due to vitrification transition.

FT-Raman analysis revealed that curing propagation mainly occurs by polyesterification between epoxide and anhydride. Possible side reactions including the homopolymerization of MA are considered. The main side reaction is decarboxylation of MA that may produce some autocatalysis, but this is a minor contribution to the kinetics of cure. No conclusive evidence has been found for homopolymerization of MA or initiation of the curing reaction by the reaction product of TGDDM and MA, compared to the polyesterification.

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ID Code: 583
Item Type: Journal Article
Keywords: FT, Raman spectroscopy, epoxy, anhydride, cure kinetics, chemorheology, epoxy resin, maleic anhydride, hexahydrophthalic anhydride, real, time cure monitoring, network cure, cure mechanisms, TGDDM, amino, glycidyl epoxy
DOI: 10.1016/j.polymer.2004.07.066
ISSN: 0032-3861
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300) > Polymerisation Mechanisms (030305)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 14 Mar 2005
Last Modified: 25 Feb 2013 13:53

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