Rheology and Morphology of Phase-Separating Polymer Blends
Rheology and Morphology of Phase-Separating Polymer Blends
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DOI：
10.1021/ma000968f
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发表时间：
2001-01
期刊：
影响因子：
5.5
通讯作者：
Z. Zhang;H. D. Zhang;Yuliang Yang;I. Vinckier;H. Laun
中科院分区：
文献类型：
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作者：
Z. Zhang;H. D. Zhang;Yuliang Yang;I. Vinckier;H. Laun
基于时间相关的Ginzburg - Landau （TDGL）方程进行了振荡剪切流下相分离的模拟。应力张量的计算采用Kawasaki提出的表达式。将模拟结果与p - α msan /PMMA的LCST共混物的实验结果进行了比较，以评价模拟的潜力。研究了淬火深度、剪切振幅和剪切频率对形貌发展和流变学性能的影响。结果表明，相分离体系的流变特性可归因于相分离过程中界面弛豫的变化。浓度波动强度和界面体积分数是决定界面松弛对共混物整体流变行为贡献的关键因素。在低频范围内，振荡剪切不影响…
Simulations of phase separation under oscillatory shear flow have been performed based on the time-dependent Ginzburg−Landau (TDGL) equation. To calculate the stress tensor, the expression proposed by Kawasaki was used. The results of the simulations have been confronted directly with experimental results on a LCST blend of PαMSAN/PMMA to evaluate the potential of the simulations. The effect of quench depth, shear amplitude, and shear frequency on the morphology development as well as on the corresponding rheological properties has been investigated. The results show that the characteristic rheological behavior of phase-separating systems can be attributed to the interfacial relaxation, which is changing during the process of phase separation. The strength of the concentration fluctuations and the interfacial volume fraction are key factors determining the contribution of interfacial relaxation to the global rheological behavior of the blend. In the low frequency range, the oscillatory shear cannot affect...