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Article Dans Une Revue Macromolecular Symposia Année : 2022

Macromolecular Mobility Changes Induced by Thermal Aging of Epoxy‐amine Polymer Networks

Résumé

Changes in macromolecular mobility during the thermal oxidation of epoxy-amine thermoset networks are addressed in this study. Three epoxy-amine systems, cured with DGEBA and three similar aliphatic hardeners – ethylenediamine (EDA), diethylenetriamine (DETA), and triethylenetetramine (TETA) – aged at 160°C are characterized by dynamic mechanical analysis (DMA). Results show a split of the single initial α relaxation peak with aging, which may imply that chain scissions are preferred at certain oxidizable sites in the network. A β relaxation can be identified around -60°C and does not seem to evolve much with aging, while another sub-glass transition around 30°C decreases with it. Implications of this work both with mechanical fracture properties and with segmental mobility of radical chemical functions involved in bimolecular oxidation reactions have yet to be confirmed.

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hal-04072695 , version 1 (18-04-2023)

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Romain Delannoy, Emmanuel Richaud, Vincent Tognetti, Blandine Quélennec, Laurent Delbreilh, et al.. Macromolecular Mobility Changes Induced by Thermal Aging of Epoxy‐amine Polymer Networks. Macromolecular Symposia, 2022, Times of Polymers and Composites (TOP), 405 (1), pp.2100228. ⟨10.1002/masy.202100228⟩. ⟨hal-04072695⟩
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