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Study of the Degradation of an Epoxy/Amine Resin, 1

✍ Scribed by Bénédicte Mailhot; Sandrine Morlat-Thérias; Mélanie Ouahioune; Jean-Luc Gardette

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
345 KB
Volume
206
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

Summary: The degradation of an epoxy/amine resin was studied under photolytic conditions in absence and in presence of oxygen and under thermooxidative conditions. The resin is obtained after curing the diglycidyl ether of bisphenol‐A (DGEBA) with a poly(propylene glycol) which is diamine terminated. The mechanisms of degradation of the two separate components before curing were also investigated. Analysis by IR and UV‐Vis spectroscopies revealed that the oxidation photoproducts detected during the degradation of the epoxy/amine result from the oxidation of the DGEBA part, of the amine crosslinks and, to a lower extent, of the poly(oxypropylene) units. Their mechanism of formation essentially involves chain scission reactions. During irradiation, the yellowing observed is mainly due to the formation of a quinone methide structure. Thermooxidation generates high discoloration with some products only generated in that case. For all experiments, a detailed analysis of the IR spectra is given with the chemical mechanisms of formation of the degradation products.

ATR‐IR spectra of an epoxy/amine sample in the carbonyl region during photooxidation.

magnified imageATR‐IR spectra of an epoxy/amine sample in the carbonyl region during photooxidation.

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