Linear Viscoelastic Predictions of a Consistently Unconstrained Brownian Slip-Link Model
Linear Viscoelastic Predictions of a Consistently Unconstrained Brownian Slip-Link Model
复制标题
一致无约束布朗滑移连接模型的线性粘弹性预测
DOI：
10.1021/ma0519056
复制
发表时间：
2006
期刊：
影响因子：
5.5
通讯作者：
J. Schieber
中科院分区：
文献类型：
--
作者：
D. M. Nair;J. Schieber
采用具有恒定链摩擦力的一致无约束布朗滑动链（CUBS）模型预测了线性缠结聚合物液体的线性流变行为。如在先前提出的无约束释放的滑动连杆模型（J. Rheol. 2003，47，213），该模型包含片段连接性、轮廓长度波动和以自洽和自然的方式的链拉伸。约束释放被认为是在一个平均场的方式，但包括波动，既作为一个二元链之间的相互作用，并作为一个多链的相互作用。与以往的平均场的作品，约束释放包括在链动力学的水平，而不是假设的松弛调制是由独立的过程中发现的两个模量的产品。这些动态不需要额外的参数。该模型还可用于进行非线性流量预测，而无需任何附加参数。我们发现，包括额外的物理约束释放提高了线性粘度…
A consistently unconstrained Brownian slip-link (CUBS) model with constant chain friction is used to predict the linear rheological behavior of linear, entangled polymeric liquids. As in the previously proposed slip-link model without constraint release (J. Rheol. 2003, 47, 213), this model contains segment connectivity, contour-length fluctuations, and chain stretching in a self-consistent and natural way. Constraint release is considered in a mean-field way, but including fluctuations, both as a binary interaction between chains, and as a multichain interaction. Unlike previous mean-field works, constraint release is included on the level of chain dynamics instead of assuming that the relaxation modulation is a product of two moduli found by independent processes. These dynamics require no additional parameters. The model may also be used to make nonlinear flow predictions without any additional parameters. We find that inclusion of the additional physics of constraint release improves the linear viscoe...