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Thermal oxidation of epoxies: Influence of diamine hardener

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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Esteve Ernault, Emmanuel Richaud, Bruno Fayolle. Thermal oxidation of epoxies: Influence of diamine hardener. Polymer Degradation and Stability, Elsevier, 2016, 134, pp.76-86. ⟨10.1016/j.polymdegradstab.2016.09.030⟩. ⟨hal-01473986⟩

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