Nano-rheological properties of polymeric solid surfaces

Tisato Kajiyama, Keiji Tanaka, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

抄録

Surface rheological analyses of polymeric solids were presented on the basis of scanning viscoelasticity microscopy (SVM) and lateral force microscopy (LFM). SVM observation for phase-separated polymer blend films revealed two-dimensional distribution of elasticity. In order to study surface thermal molecular motion of monodisperse polystyrene (PS), SVM and LFM measurements were made at various temperatures. Glass transition temperature, Tg, at the surface was discerned to be markedly lower than the corresponding bulk Tg, and the discrepancy of Tg between surface and bulk became larger with decreasing molecular weight. Such an intensive activation of thermal molecular motion at the PS surface can be explained in terms of an excess free volume induced by the segregated chain ends and a reduced cooperativity at the surface. Bulk Tg of miscible binary blends can be well expressed by the Gordon-Taylor equation. Extending this notion to surface, the surface composition in blends would be obtained by measuring surface Tg of each constituent as well as their blend. The surface composition in blend films of two PSs with different molecular weights was experimentally and systematically elucidated. The surface enrichment of a smaller molecular weight component became more remarkable with increasing molecular weight disparity between the two components due probably to an entropic effect.

元の言語英語
ページ(範囲)33-40
ページ数8
ジャーナルNihon Reoroji Gakkaishi
31
発行部数1
DOI
出版物ステータス出版済み - 6 23 2003

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solid surfaces
Microscopic examination
Viscoelasticity
Molecular weight
molecular weight
microscopy
viscoelasticity
Polystyrenes
Scanning
Surface structure
scanning
polystyrene
Free volume
Polymer blends
polymer blends
Elasticity
glass transition temperature
Chemical activation
elastic properties
activation

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

これを引用

Nano-rheological properties of polymeric solid surfaces. / Kajiyama, Tisato; Tanaka, Keiji; Takahara, Atsushi.

:: Nihon Reoroji Gakkaishi, 巻 31, 番号 1, 23.06.2003, p. 33-40.

研究成果: ジャーナルへの寄稿記事

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