Surface molecular motion of the monodisperse polystyrene films

Tisato Kajiyama, Keiji Tanaka, Atsushi Takahara

研究成果: ジャーナルへの寄稿記事

294 引用 (Scopus)

抄録

Forced modulation scanning force microscopic (SFM) and lateral force microscopic (LFM) measurements of the monodisperse polystyrene (PS) films were carried out at 293 K in order to reveal surface molecular motion. Surface dynamic storage modulus, E′, and surface loss tangent, tan δ, of the monodisperse PS films were evaluated on the basis of forced modulation SFM measurement. It was revealed that the magnitudes of surface E′ and surface tan δ were lower and higher than those for its bulk state, respectively, in the case of the number-average molecular weight (Mn) lower than 26.6k. Based on forced modulation SFM measurements, the surface of the PS film with Mn lower than 26.6k was in a glass-rubber transition state even at 293 K, in spite of that the bulk Tg was far above 293 K. LFM measurements for the PS films revealed that the magnitude of lateral force was dependent on the scanning rate of the cantilever tip in the case of Mn lower than 40.4k. The scanning rate dependence of lateral force appeared in the case that the surface of the PS film was in a glass-rubber transition state. LFM results agreed well with forced modulation SFM ones if the scanning rate of the cantilever tip for LFM measurement was converted to the measuring frequency for forced modulation SFM measurement. The active thermal molecular motion on the polymeric surface was explained by the excess free volume induced due to the surface localization of chain end groups. The surface enrichment of chain end groups was confirmed by dynamic secondary ion mass spectroscopic measurement.

元の言語英語
ページ(範囲)280-285
ページ数6
ジャーナルMacromolecules
30
発行部数2
DOI
出版物ステータス出版済み - 1 27 1997

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Polystyrenes
Scanning
Modulation
Rubber
Glass
Free volume
Elastic moduli
Molecular weight
Ions

All Science Journal Classification (ASJC) codes

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

これを引用

Surface molecular motion of the monodisperse polystyrene films. / Kajiyama, Tisato; Tanaka, Keiji; Takahara, Atsushi.

:: Macromolecules, 巻 30, 番号 2, 27.01.1997, p. 280-285.

研究成果: ジャーナルへの寄稿記事

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