Glassy dynamics in thin polymer layers having a free upper interface

被引：118

作者：

Serghei, A. ^{[1
]}

Huth, H. ^{[2
]}

Schick, C. ^{[2
]}

Kremer, F. ^{[1
]}

机构：

[1] Univ Leipzig, Inst Expt Phys 1, D-04103 Leipzig, Germany

[2] Univ Rostock, Dept Phys, D-18051 Rostock, Germany

来源：

MACROMOLECULES | 2008年 / 41卷 / 10期

关键词：

D O I：

10.1021/ma702381t

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The molecular dynamics in thin polymer layers having a free upper interface is investigated by means of Broadband Dielectric Spectroscopy and AC-calorimetry. Down to film thicknesses of similar to 10 nm no shifts in the average relaxation time and no broadening of the dynamic glass transition are detected for polystyrene, poly(methyl methacrylate), poly(vinyl acetate), poly(gamma-benzyl-L-glutamate) and poly(2-vinyl pyridine). This experimental finding restricts to a few nanometers the length-scale of a possible alteration of the polymer mobility in the vicinity of free interfaces.

引用

页码：3636 / 3639

页数：4