Molecular weight dependence of reductions in the glass transition temperature of thin, freely standing polymer films

被引:321
作者
Dalnoki-Veress, K [1 ]
Forrest, JA
Murray, C
Gigault, C
Dutcher, JR
机构
[1] Univ Guelph, Dept Phys, Guelph, ON N1G 2W1, Canada
[2] Univ Guelph, Guelph Waterloo Phys Inst, Guelph, ON N1G 2W1, Canada
[3] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada
[4] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada
来源
PHYSICAL REVIEW E | 2001年 / 63卷 / 03期
关键词
D O I
10.1103/PhysRevE.63.031801
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 transmission ellipsometry to perform a comprehensive study of the glass transition temperature T-g of freely standing polystyrene films. Six molecular weights (M) over bar (w), ranging from 575 X 10(3) to 9100 X 10(3), were used in the study. For each (M) over bar (w), value, large reductions in T-g (as much as 80 degreesC below the bulk value) were observed as the film thickness h was decreased. We have studied in detail the dependence of the T-g reductions on (M) over bar (w) in a regime dominated by chain confinement effects. The empirical analysis presented is highly suggestive of the existence of a mechanism of mobility in thin freely standing films that is inhibited in the bulk and distinct from the usual cooperative motion associated with the glass transition.
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页数:10
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