Nonequilibrium Polymer Rheology in Spin-Cast Films
Nonequilibrium Polymer Rheology in Spin-Cast Films
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DOI：
10.1103/physrevlett.102.248303
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发表时间：
2009-06-19
影响因子：
8.6
通讯作者：
Steiner, Ullrich
中科院分区：
文献类型：
--
作者：
Barbero, David R.;Steiner, Ullrich
介绍了一种新的实验方法来探测大于或类似于100 nm厚的液体聚合物膜的流变性。发现铸态膜与退火膜相比具有显著降低的有效粘度。降低的粘度解释的非平衡链构象引起的纠缠密度降低所造成的快速淬火的薄膜在旋涂过程中。膜需要在高温下出乎意料地长的退火时间来恢复其本体流变性。
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.