期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 41, 期 24, 页码 3339-3345出版社
WILEY
DOI: 10.1002/polb.10702
关键词
glass transition; nanocomposites; polystyrene; thin films
The glass-transition temperatures (T-g's) of nanocomposites of polystyrene (PS) and single-walled carbon nanotubes were measured in the bulk and in thin films with differential scanning calorimetry and spectroscopic ellipsometry, respectively. The bulk T-g of the nanocomposites increased by approximately 3degreesC and became much broader than that of PS. For the nanocomposite films thinner than 45 nm, T-g decreased with decreasing film thickness [i.e., DeltaTg(nano)<0]. This phenomenon also occurred in thin PS films, the magnitude of the depression in PS [Delta T-g(PS)] being somewhat larger. The film thickness dependence and the differences in the magnitude of Delta T-g in the two systems were examined in light of current theory, and a quantitative comparison was made. (C) 2003 Wiley Periodicals, Inc.
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