Journal
EUROPEAN PHYSICAL JOURNAL E
Volume 8, Issue 2, Pages 217-224Publisher
SPRINGER
DOI: 10.1140/epje/i2001-10088-4
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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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