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Local dynamic mechanical properties in model free-standing polymer thin films

J. Chem. Phys. 122, 144712 (2005); doi:10.1063/1.1873732

Published 14 April 2005

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Kenji Yoshimoto, Tushar S. Jain, Paul F. Nealey, and Juan J. de Pablo
Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706-1691
High-frequency sinusoidal oscillations of a coarse-grained polymer model are used to calculate the local dynamic mechanical properties (DMPs) of free-standing polymer thin films. The storage modulus G[prime] and loss modulus G[double-prime] are examined as a function of position normal to the free surfaces. It is found that mechanically soft layers arise near the free surfaces of glassy thin films, and that their thickness becomes comparable to the entire film thickness as the temperature approaches the glass transition Tg. As a result, the overall stiffness of glassy thin films decreases with film thickness. It is also shown that two regions coexist in thin films just at the bulk Tg; a melt-like region (G[prime]<G[double-prime]) near the free surfaces and a glass-like region (G[prime]>G[double-prime]) in the middle of the film. Our findings on the existence of a heterogeneous distribution of DMPs in free-standing polymer thin films provide insights into recent experimental measurements of the mechanical properties of glassy polymer thin films. ©2005 American Institute of Physics
History: Received 15 December 2004; accepted 25 January 2005; published 14 April 2005
Permalink: http://link.aip.org/link/?JCPSA6/122/144712/1
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0021-9606 (print)   1089-7690 (online)
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