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The European Physical Journal E

, Volume 8, Issue 2, pp 217–224 | Cite as

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

  • Y. Grohens
  • L. Hamon
  • G. Reiter
  • A. Soldera
  • Y. Holl

Abstract:

We have measured, the thickness dependence of the glass transition temperature Tg(h), using ellipsometry at variable temperature, for poly(methyl-methacrylate) (PMMA) of various tacticity in confined geometry. We report that several factors significantly affect Tg(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 Tg(h)? Does Tg(h) depend on the modifications of conformational parameters of the chains (their entropy)? What is the correlation between local dynamics and Tg(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.

PACS. 64.70.Pf Glass transitions – 61.41.+e Polymers, elastomers, and plastics – 68.60.-p Physical properties of thin films, nonelectronic – 61.20.-p Structure of liquids 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 2002

Authors and Affiliations

  • Y. Grohens
    • 1
  • L. Hamon
    • 2
  • G. Reiter
    • 2
  • A. Soldera
    • 3
  • Y. Holl
    • 4
  1. 1.Laboratoire Polymères et Procédés, Université de Bretagne Sud, Rue St. Maudé, BP 92116, 56325 Lorient Cedex, FranceFR
  2. 2.Institut de Chimie des Surfaces et Interfaces, 15 Rue J. Starcky, BP 2488, 68057 Mulhouse, FranceFR
  3. 3.Université de Sherbrooke, Faculté des Sciences, Département de Chimie, Sherbrooke, J1K2R1, CanadaCA
  4. 4.Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg Cedex, FranceFR

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