Molecular motion in ultrathin polystyrene films: Dynamic mechanical analysis of surface and interfacial effects

Kei Ichi Akabori, Keiji Tanaka, Toshihiko Nagamura, Atsushi Takahara, Tisato Kajiyama

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)

Abstract

Dynamic mechanical analysis was successfully used, for the first time, to characterize polymer thin and ultrathin films supported on substrates. This method allowed us to uncover the effects of the free surface and the substrate interface on the segmental dynamics in polystyrene (PS) films with various thicknesses. As the film thickness decreased, the distribution of relaxation times for the segmental motion became broader, a change mainly due to surface and interfacial effects. Interestingly, PS ultrathin films sandwiched with SiOx layers exhibited a relaxation process corresponding to the interfacial segmental motion in addition to that in the internal region of the films. The results obtained in this study imply that two contrasting effects exist: the effect of the free surface accelerates the segmental motion, whereas interfacial interactions produce the opposite effect.

Original languageEnglish
Pages (from-to)9735-9741
Number of pages7
JournalMacromolecules
Volume38
Issue number23
DOIs
Publication statusPublished - Nov 15 2005

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

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