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Depression of the Glass Transition Temperature in Ultra-Thin, Grafted Polystyrene Films

Published online by Cambridge University Press:  15 February 2011

J. L. Keddie  and
R. A. L. Jones
J. L. Keddie
Affiliation:
Polymer and Colloid Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, UK
R. A. L. Jones
Affiliation:
Polymer and Colloid Group, Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 OHE, UK
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Abstract

We have used ellipsometry to measure the glass transition temperature (Tg) of ultrathin films of polystyrene (PS) (less than 10 nm thick) obtained by grafting PS-COOH on the native oxide of Si. We find that Tg in these ultra-thin films is depressed from the bulk value by as much as, 35 K. This is in qualitative accord with our earlier results on thicker non-grafted films of PS.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 183
Copyright
Copyright © Materials Research Society 1995

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