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Ageing of Polyimide under thermal stress: relaxationnal effects and charge transport

Henri, Victor and Dantras, Eric and Lacabanne, Colette and Koliatene, Flavien and Trebosc, Christophe Ageing of Polyimide under thermal stress: relaxationnal effects and charge transport. (2021) Polymer Degradation and Stability, 186. 109524. ISSN 0141-3910

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Official URL: https://doi.org/10.1016/j.polymdegradstab.2021.109524

Abstract

Polyimide is one of the most used polymer for electrical insulation in severe environment. For future aircrafts, polymer electrical insulation will be exposed to thermal constraints that can affect its physic- ochemical structure. Effects of thermal ageing are studied through their impact on the relaxational be- haviour. Thermal degradation impairs first the aromatic entities and lately the carbonyls. It is responsible for the strong acceleration of mobility observed for both localised βand γrelaxation modes. Both DMA and swelling test exhibit an acceleration of localized molecular mobility. However, as the local mobility is accelerated, the increase in heterogeneities visible through the evolution of the MWS polarisation brings up to light a change in the charge transport mechanism. The chain scission degradation mechanism, leads to a decrease of the density of deep traps. It explains the evolution of both the value of DC conductivity and its activation energy upon ageing.

Item Type:Article
HAL Id:hal-03164667
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
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Deposited On:10 Mar 2021 09:09

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