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Metal – polymer interfaces and their effect on the glass transition of thin polystyrene films

Published online by Cambridge University Press:  01 February 2011

J.S. Sharp  and
J.A. Forrest
J.S. Sharp
Affiliation:
School of Physics and Astronomy, University of Nottingham, Nottingham U.K. NG7 2RD
J.A. Forrest
Affiliation:
Department of Physics and Guelph - Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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Abstract

We present a study of polystyrene-metal interfaces and discuss the relationship between the interfacial structure and anomalies in the measured glass transition temperature (T g ) of thin metal capped polystyrene (PS) films. The PS films used in these studies were coated with an evaporated metal layer of either Aluminum (Al) or gold (Au) and the T g values were measured with ellipsometry. Uncoated PS films were also measured and these samples showed T g values that were reduced relative to the bulk value for film thicknesses (h) less than 40 nm. Films coated with Au were shown to have measured T g values that were the same as the bulk value (T g bulk=370 K) for all the film thicknesses studied (h ≥ 8nm). The Al coated PS films had measured T g values that were the same as the uncoated PS films. The observed differences are discussed in terms of the differences in the structure of the metal-polymer interfaces produced during thermal evaporation of the metal layers. A novel sample preparation procedure was developed to enable us to use Atomic Force Microscopy (AFM) to directly measure the structure of the buried polymer-metal interfaces. The measurements performed on these systems support the suggestion that the interfacial structure is different for the two metal-polymer interfaces studied and that these differences may be the cause of the anomalies in the measured T g s of these samples.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 790: Symposium P – Dynamics in Small Confining Systems–2003 , 2003 , P9.4
Copyright
Copyright © Materials Research Society 2004

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References

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