Nanoscopic-confinement effects on local dynamics

被引：261
作者：
Anastasiadis, SH
Karatasos, K
Vlachos, G
Manias, E
Giannelis, EP
机构：
[1] Fdn Res & Technol Hellas, Inst Elect Struct & Laser, Heraklion 71110, Crete, Greece
[2] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA
[3] Univ Crete, Dept Phys, Heraklion 71003, Crete, Greece
来源：
PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 05期
关键词：
D O I：
10.1103/PhysRevLett.84.915
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The segmental dynamics of 1.5-2.0 nm polymer films confined between parallel solid surfaces is investigated with dielectric spectroscopy in polymer/silicate intercalated nanocomposites. The confinement effect is evident by the observation of a mode, much faster than the bulk-polymer alpha relaxation and exhibiting much weaker temperature dependence. This is discussed in relation to either the interlayer spacing restricting the cooperative volume of the alpha relaxation or to the dominance of the more mobile interphase regions as predicted by simulations; the data qualitatively support the former.
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页码：915 / 918
页数：4
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