抄録
Surface mobility in polystyrene (PS) films was studied using (PS/deuterated PS) bilayer films, which were prepared by attaching original two surfaces together. Time evolution of the bilayer interface at various temperatures was examined by dynamic secondary ion mass spectroscopy in conjunction with neutron reflectivity. When the bilayer was annealed at a temperature above bulk glass transition temperature, Tgb, the interfacial thickening was well expressed by the context of Fickian diffusion. On the other hand, in the case of an annealing temperature above surface glass transition temperature, Tgs, and below Tgb, the interface monotonically thickened with the time at first and then turned to be independent. This means that chains went across the "mobile" interface and then reached the "dead" bulk region in which the diffusivity should be frozen. Hence, it was claimed that chains could diffuse discernibly in the surface region even at a temperature lower than the Tgb. On the basis of temperature and molecular weight dependences of quasi-equilibrium interfacial thickness after a sufficiently long time, a possible model of mobility gradient in the surface region was proposed.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 1235-1240 |
| ページ数 | 6 |
| ジャーナル | Macromolecules |
| 巻 | 36 |
| 発行部数 | 4 |
| DOI | |
| 出版物ステータス | 出版済み - 2 25 2003 |
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All Science Journal Classification (ASJC) codes
- Organic Chemistry
- Polymers and Plastics
- Inorganic Chemistry
- Materials Chemistry
これを引用
Mobility gradient in surface region of monodisperse polystyrene films. / Kawaguchi, Daisuke; Tanaka, Keiji; Kajiyama, Tisato; Takahara, Atsushi; Tasaki, Seiji.
：: Macromolecules, 巻 36, 番号 4, 25.02.2003, p. 1235-1240.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Mobility gradient in surface region of monodisperse polystyrene films
AU - Kawaguchi, Daisuke
AU - Tanaka, Keiji
AU - Kajiyama, Tisato
AU - Takahara, Atsushi
AU - Tasaki, Seiji
PY - 2003/2/25
Y1 - 2003/2/25
N2 - Surface mobility in polystyrene (PS) films was studied using (PS/deuterated PS) bilayer films, which were prepared by attaching original two surfaces together. Time evolution of the bilayer interface at various temperatures was examined by dynamic secondary ion mass spectroscopy in conjunction with neutron reflectivity. When the bilayer was annealed at a temperature above bulk glass transition temperature, Tgb, the interfacial thickening was well expressed by the context of Fickian diffusion. On the other hand, in the case of an annealing temperature above surface glass transition temperature, Tgs, and below Tgb, the interface monotonically thickened with the time at first and then turned to be independent. This means that chains went across the "mobile" interface and then reached the "dead" bulk region in which the diffusivity should be frozen. Hence, it was claimed that chains could diffuse discernibly in the surface region even at a temperature lower than the Tgb. On the basis of temperature and molecular weight dependences of quasi-equilibrium interfacial thickness after a sufficiently long time, a possible model of mobility gradient in the surface region was proposed.
AB - Surface mobility in polystyrene (PS) films was studied using (PS/deuterated PS) bilayer films, which were prepared by attaching original two surfaces together. Time evolution of the bilayer interface at various temperatures was examined by dynamic secondary ion mass spectroscopy in conjunction with neutron reflectivity. When the bilayer was annealed at a temperature above bulk glass transition temperature, Tgb, the interfacial thickening was well expressed by the context of Fickian diffusion. On the other hand, in the case of an annealing temperature above surface glass transition temperature, Tgs, and below Tgb, the interface monotonically thickened with the time at first and then turned to be independent. This means that chains went across the "mobile" interface and then reached the "dead" bulk region in which the diffusivity should be frozen. Hence, it was claimed that chains could diffuse discernibly in the surface region even at a temperature lower than the Tgb. On the basis of temperature and molecular weight dependences of quasi-equilibrium interfacial thickness after a sufficiently long time, a possible model of mobility gradient in the surface region was proposed.
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U2 - 10.1021/ma025667f
DO - 10.1021/ma025667f
M3 - Article
AN - SCOPUS:0037465032
VL - 36
SP - 1235
EP - 1240
JO - Macromolecules
JF - Macromolecules
SN - 0024-9297
IS - 4
ER -