GLASS TRANSITION IN THIN POLYMER FILMS: A MOLECULAR DYNAMICS STUDY

Fathollah Varnik (), Kurt Binder () and Jörg Baschnagel ()
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Fathollah Varnik: Johannes Gutenberg-Universität, Staudinger Weg 7, D–55099 Mainz, Germany
Kurt Binder: Johannes Gutenberg-Universität, Staudinger Weg 7, D–55099 Mainz, Germany
Jörg Baschnagel: Institut Charles Sadron, 6 rue Boussingault, 67083 Strasbourg, France

International Journal of Modern Physics C (IJMPC), 2002, vol. 13, issue 06, 799-804

Abstract: A melt of nonentangled polymer chains confined between two smooth and purely repulsive walls is studied for various film thicknessesDand temperatures. The dynamics of the supercooled films is qualitatively identical to that of the bulk, but the walls lead to faster relaxation. To quantify this observation we analyze the data by the mode-coupling theory (MCT) of the glass transition. We find that the critical temperature of MCT,Tc(D), decreases withDand thatT - Tc(D)is a relevant temperature scale. The static structure factor and dynamic correlation functions at intermediate times coincide with bulk behavior when compared to the sameT - Tc(D).

Keywords: Glass transition; structural glasses; polymer dynamics; thin polymer films (search for similar items in EconPapers)
Date: 2002
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DOI: 10.1142/S0129183102003516

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