Analysis of Surface Mobility in Polystyrene Films with Monodisperse and Bimodal Molecular Weights by Lateral Force Microscopy

Tisato Kajiyama, Keiji Tanaka, Atsushi Takahara

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The surface glass-transition temperature (Tgs) in monodisperse polystyrene (PS) films was examined on the basis of the temperature dependence of the lateral force at a given scanning rate. T gs of the PS films was found to be markedly lower than the corresponding bulk glass-transition temperature over the entire molecular weight range (4900-1,460,000). Also, the apparent activation energy of the surface segmental motion in the PS films was 230 ± 10 kJ mol -1, significantly smaller than that for bulk PS. Finally, T gs measurement by lateral force microscopy was applied to binary PS mixtures with different molecular weights. On the basis of the Gordon-Taylor equation, the surface composition of the shorter component in the blend films was successfully obtained.

Original languageEnglish
Pages (from-to)639-647
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume42
Issue number3
DOIs
Publication statusPublished - Feb 1 2004

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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