Nonequilibrium Polymer Rheology in Spin-Cast Films

被引：120

作者：

Barbero, David R. ^{[2
]}

Steiner, Ullrich ^{[1
,2
]}

机构：

[1] Univ Freiburg, Freiburg Intitute Adv Studies, D-7800 Freiburg, Germany

[2] Univ Cambridge, Dept Phys, Nanosci Ctr, Cambridge CB3 0HE, England

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 24期

关键词：

GLASS-TRANSITION; THIN; POLYSTYRENE;

D O I：

10.1103/PhysRevLett.102.248303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A new experimental approach is introduced to probe the rheology of greater than or similar to 100 nm-thick liquid polymer films. As-cast films were found to have a substantially reduced effective viscosity compared to annealed films. The reduced viscosity is explained in terms of nonequilibrium chain conformations giving rise to a reduced entanglement density caused by the rapid quenching of the film during spin coating. Unexpectedly long annealing times at high temperatures are required for the films to recover their bulk rheology.

引用

页数：4

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