Abstract
Thin polystyrene films are prepared by spin-coating and annealed above the calorimetric glass transition temperature Tg alternatively in vacuum, in a pure nitrogen atmosphere, in the presence of water vapor or in ambient air. It is experimentally shown that these preparative conditions have a pronounced impact on the stability of the samples, on their surface topography and on the molecular mobility. Our results are discussed with respect to actual experiments. For thin polystyrene films annealed in high vacuum and measured in a pure nitrogen atmosphere no T g reductions are found down to a thickness of 20 nm.
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Acknowledgments
The authors thank B. Voit, K.-J. Eichhorn and Y. Mikhailova for providing the hyperbranched polyesters.
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Serghei, A., Kremer, F. Unexpected Preparative Effects on the Properties of Thin Polymer Films. In: Grundke, K., Stamm, M., Adler, HJ. (eds) Characterization of Polymer Surfaces and Thin Films. Progress in Colloid and Polymer Science, vol 132. Springer, Berlin, Heidelberg. https://doi.org/10.1007/2882_038
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DOI: https://doi.org/10.1007/2882_038
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