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Molecular Weight Dependence of the Surface Glass Transition of Polystyrene Films Investigated by the Embedding of Gold Nanoclusters

Published online by Cambridge University Press:  17 March 2011

J. Erichsen ,
K. Günther-Schade ,
K. Dolgner ,
T. Strunskus ,
V. Zaporojtchenko  and
F. Faupel
J. Erichsen
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
K. Günther-Schade
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
K. Dolgner
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
T. Strunskus
Affiliation:
Current address: Lehrstuhl für Physikalische Chemie I, University of Bochum, Universitätsstr. 150, 44801 Bochum, Germany
V. Zaporojtchenko
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
F. Faupel*
Affiliation:
Lehrstuhl für Materialverbunde, Faculty of Engineering, University of Kiel, Kaiserstr. 2, 24143 Kiel, Germany
*
corresponding author ff@tf.uni-kiel.de
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Abstract

We probed the glass transition temperature Tg at the surface of polystyrene (PS) samples with different molecular weights by embedding of gold nanoclusters. The embedding of the nano-clusters was monitored by x-ray photoelectron spectroscopy (XPS). The onset embedding temperature determined by XPS was taken as a measure for the Tg at the surface. We observed a small decrease of Tg at the surface relative to the bulk for all molecular weights (ΔTg= 2.5- 8.5 K). This decrease is small for short chains (MW = 3.6 kg/mol) and grows to a saturation for MW ≥ 44 kg/mol (ΔTg ≍ 8 K). This is in accord with the smaller relative increase in the number of degrees of freedom between bulk and surface for shorter chains.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 710: Symposia DD – Polymer Interfaces and Thin Films , 2001 , DD14.5.1
Copyright
Copyright © Materials Research Society 2002

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References

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