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Glass transition temperatures of isotactic poly(methymethacrylate) thin films and individual chains probed by multi wavelength ellipsometry

Published online by Cambridge University Press:  28 September 2011

A. El Ouakili ,
G. Vignaud ,
E. Balnois ,
J.-F. Bardeau  and
Y. Grohens
A. El Ouakili
Affiliation:
Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UEB), Centre de Recherche, BP 92116, Rue Saint Maudé, 56321 Lorient, France Laboratoire de Physique de l'État Condensé, UMR CNRS 6087, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
G. Vignaud*
Affiliation:
Laboratoire de Physique de l'État Condensé, UMR CNRS 6087, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
E. Balnois
Affiliation:
Laboratoire de Physique de l'État Condensé, UMR CNRS 6087, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
J.-F. Bardeau
Affiliation:
Laboratoire d'Ingénierie des Matériaux de Bretagne (LIMATB), Université de Bretagne Sud (UEB), Centre de Recherche, BP 92116, Rue Saint Maudé, 56321 Lorient, France
Y. Grohens
Affiliation:
Laboratoire de Physique de l'État Condensé, UMR CNRS 6087, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
*
ae-mail: guillaume.vignaud@univ-ubs.fr
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Abstract

Ellipsometry is used as a technique to determine glass temperature transitions of isotactic Poly(methyl methacrylate) (iPMMA) ultra-thin films and isolated chains deposited on a silicon wafer surface. The importance of systematically probing the samples at different wavelengths is pointed out in this work since for a similar thin film, slope changes in delta are more or less pronounced according to the wavelength used. The technique performed on iPMMA thin films and isolated globular chains, deposited on Piranha treated surfaces, reveals the presence of multiple transitions, whereas films of comparable thicknesses deposited on HF treated silicon wafers show only one transition. The results confirm the assumptions of a layered structure yielding specific Tg(h) which depends on depth location, which is in good agreement with recent theories of glass transitions in confined polymers, and emphasize the influence of polymer-substrate interactions and chain disentanglement.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 56 , Issue 1: Topical Issue: 5th Colloquium Interdisciplinary in Instrumentation (C2I) 2010 , October 2011 , 13703
Copyright
© EDP Sciences, 2011

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