Article Dans Une Revue European Physical Journal E: Soft matter and biological physics Année : 2002

Some relevant parameters affecting the glass transition of supported ultra-thin polymer films

Résumé

We have measured, the thickness dependence of the glass transition temperature T g(h), using ellipsometry at variable temperature, for poly(methyl-methacrylate) (PMMA) of various tacticity in confined geometry. We report that several factors significantly affect T g(h): i) polymer microstructure (stereoregularity of PMMA) related to local dynamics; ii) interfacial interactions; iii) conformation of the polymer chains. These results raise many fundamental questions on the origin of the thickness-dependent glass transition. Why and how do the interactions with the substrate significantly affect T g(h)? Does T g(h) depend on the modifications of conformational parameters of the chains (their entropy)? What is the correlation between local dynamics and T g(h) in thin films? The aim of this paper is to summarise these open questions, which should stimulate further investigations in the thin polymer film scientific community.

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Dates et versions

hal-05127895 , version 1 (24-06-2025)

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Y. Grohens, L. Hamon, A. Soldera, Y. Holl. Some relevant parameters affecting the glass transition of supported ultra-thin polymer films. European Physical Journal E: Soft matter and biological physics, 2002, 8 (2), pp.217-224. ⟨10.1140/epje/i2001-10088-4⟩. ⟨hal-05127895⟩
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