Relaxation dynamics in ultrathin polymer films

被引:118
作者
Forrest, JA
Svanberg, C
Revesz, K
Rodahl, M
Torell, LM
Kasemo, B
机构
[1] Chalmers Univ Technol, Dept Expt Phys, S-41296 Gothenburg, Sweden
[2] Chalmers Univ Technol, Dept Appl Phys, S-41296 Gothenburg, Sweden
来源
PHYSICAL REVIEW E | 1998年 / 58卷 / 02期
关键词
D O I
10.1103/PhysRevE.58.R1226
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
We have used photon correlation spectroscopy and quartz crystal microbalance techniques to examine the relaxation dynamics of ultrathin (h<400 Angstrom) polystyrene films in both supported and freely standing geometries. These studies probe relaxation dynamics of polymer films in which the glass transition temperature (T-g) is reduced below the hulk value. Both the shape of the relaxation function and the dependence of relaxation time on temperature above the glass transition are remarkably similar to that of the bulk polymer, though the range of relaxation times is shifted according to the shift in T-g. The results indicate that the microscopic relaxation dynamics of thin films remain similar to that of the bulk polymer even, in the extreme case in which the T-g, value is shifted more than 70 K below the bulk value.
引用
收藏
页码:R1226 / R1229
页数:4
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