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

doi:10.1021/ma051143e

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

Department of Applied Molecular Chemistry

Research output: Contribution to journal › Article › peer-review

67 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 SiO_x 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 language	English
Pages (from-to)	9735-9741
Number of pages	7
Journal	Macromolecules
Volume	38
Issue number	23
DOIs	https://doi.org/10.1021/ma051143e
Publication status	Published - Nov 15 2005

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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10.1021/ma051143e

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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.",

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T1 - Molecular motion in ultrathin polystyrene films

T2 - Dynamic mechanical analysis of surface and interfacial effects

AU - Akabori, Kei Ichi

AU - Tanaka, Keiji

AU - Nagamura, Toshihiko

AU - Takahara, Atsushi

AU - Kajiyama, Tisato

PY - 2005/11/15

Y1 - 2005/11/15

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AB - 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.

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

Abstract

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