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Dynamic glass transition of filled polysiloxane upon electron irradiation

Roggero, Aurélien and Dantras, Eric and Paulmier, Thierry and Tonon, Claire and Lewandowski, Simon and Dagras, Sabine and Payan, Denis Dynamic glass transition of filled polysiloxane upon electron irradiation. (2017) Journal of Non-Crystalline Solids, 455. 17-23. ISSN 0022-3093

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Official URL: http://dx.doi.org/10.1016/j.jnoncrysol.2016.10.025

Abstract

The influence of radiation-induced crosslinking on the molecular mobility of a filled silicone elastomer near the glass transition (α-relaxation) was analyzed using broadband dielectric spectroscopy. Samples of the isolated polysiloxane matrix (neat) were also studied so as to assess the filler influence on the evolution of the α-relaxation. A slowing-down of the segmental dynamics was observed with increasing ionizing dose. It was ascribed to the relaxing dipoles losing degrees of freedom as a result of network stiffening. An enhancement of intermolecular coupling, associatedwith the cooperativity of the α-relaxation,was deduced fromthe dielectric analysis. Similar observations were made in the past with chemically crosslinked polysiloxanes. This study evidenced that even though the crosslinks formed upon chemical crosslinking (mainly Si\\CH2\\CH2\\Si) differ in nature from those formed upon irradiation (mainly SiO3 and SiO4), they affect the dynamic glass transition in a very similar way. The filler influence on the dynamic glass transition was also studied upon irradiation. One of the main outcomes of this study is the fading of the filler-related effect in themost irradiated samples: both the shape and dynamics of the α-relaxation were identical in the most highly irradiated neat and filled samples.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com
HAL Id:hal-01440333
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Airbus (FRANCE)
French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: cirimat webmestre
Deposited On:19 Jan 2017 10:30

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