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Thermal oxidation of epoxies: Influence of diamine hardener

Article dans une revue avec comité de lecture
Author
ERNAULT, Esteve
ccFAYOLLE, Bruno
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccRICHAUD, Emmanuel

URI
http://hdl.handle.net/10985/11555
DOI
10.1016/j.polymdegradstab.2016.09.030
Date
2016
Journal
Polymer Degradation and Stability

Abstract

This work reports the thermal oxidation of DGEBA resins totally cured with cycloaliphatic (isophorone diamine) or with linear aliphatic (trioxa-tridecanediamine or TTDA) diamine hardener. Chemical changes (carbonyl build-up) were monitored by FTIR and macromolecular changes (chains scission and crosslinking) from Tg variations measured by DSC. Exposition at several temperatures and under several oxygen pressures showed that DGEBA/IPDA has systematically the highest oxidation rate. It was also observed that DGEBA/IPDA undergoes mainly chain scissions whereas DGEBA/TTDA undergoes a predominant crosslinking under air being partially suppressed under enhanced oxygen pressure. Results were discussed on the basis of the possible influence of the structure of hardener.

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