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Title: Heterogeneity in Polymer Thin Films
Authors: Kanaya, Toshiji  KAKEN_id
Inoue, Rintaro  kyouindb  KAKEN_id
Nishida, Koji  kyouindb  KAKEN_id
Keywords: polymer films
neutron-nucleus scattering
glass transition
mechanical properties
Issue Date: 2011
Publisher: American Institute of Physics
Journal title: AIP Conference Proceedings
Volume: 1349
Start page: 23
End page: 26
Abstract: In the last two decades very extensive studies have been performed on polymer thin films to reveal very interesting but unusual properties. One of the most interesting findings is the decrease in glass transition temperature Tg with film thickness in polystyrene (PS) thin film supported on Si substrate. Another interesting finding is apparent negative thermal expansivity in glassy state for thin films below ∼25 nm. In order to understand the unusual properties of polymer thin films we have studied temperature dependence of thickness of polystyrene thin films by means of X‐ray and neutron reflectivity. In addition, we also studied dynamics of PS thin films using inelastic neutron scattering. In the presentation we will discuss the results from viewpoints of heterogeneity of polymer thin films. Finally we did neutron reflectivity measurements on a 5‐layer thin film, consisting of alternatively stacked d‐PS and h‐PS layers to see the distribution of glass transition temperature and thermal expansivity directly.
Rights: Copyright 2011 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in AIP Conference Proceedings 1349, 23 (2011) and may be found at
DOI(Published Version): 10.1063/1.3605729
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