The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
复制标题
对流约束释放在近单分散缠结聚合物溶液平行叠加流中的作用
DOI：
10.1007/s00397-013-0755-x
复制
发表时间：
2014
期刊：
影响因子：
2.3
通讯作者：
G. Ianniruberto
中科院分区：
文献类型：
--
作者：
Herwin Jerome Unidad;G. Ianniruberto
Li和Wang（Macromolecules 43：5904-5908，2010）最近对几乎单分散缠结聚合物溶液的平行叠加流的实验揭示了松弛动力学的流动诱导加速，在此通过使用基于管模型的简单微分本构方程来分析，以检查对流约束释放（CCR）在这些情况下的作用。与Wang及其同事的预期相反，我们发现这种流动诱导的加速不是CCR效应。相反，我们的研究结果表明，加速仅仅是由于对流本身（不要与CCR混淆）和非线性取向效应。
Recent experiments by Li and Wang (Macromolecules 43:5904–5908, 2010) on parallel superposition flows of nearly monodisperse entangled polymer solutions revealing a flow-induced acceleration of the relaxation dynamics are here analyzed by using a simple differential constitutive equation based on the tube model to examine the role of convective constraint release (CCR) in these situations. Contrary to the expectations of Wang and coworkers, we find that such a flow-induced acceleration is not a CCR effect. Rather, our results suggest that the acceleration is simply due to convection per se (not to be confused with CCR) and to nonlinear orientation effects.