Dielectric and Viscoelastic Study of Entanglement Dynamics: A Review of Recent Findings
Dielectric and Viscoelastic Study of Entanglement Dynamics: A Review of Recent Findings
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DOI：
10.1002/masy.200551005
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发表时间：
2005-08
影响因子：
--
通讯作者：
H. Watanabe;Yumi Matsumiya;Tadashi Inoue
中科院分区：
文献类型：
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作者：
H. Watanabe;Yumi Matsumiya;Tadashi Inoue
本文综述了近年来线性顺式聚异戊二烯纠缠二元共混物的介电和粘弹性研究结果，以解释基于动态管膨胀（DTD）分子图的平衡纠缠动力学的最新认识。电介质和粘弹性性能的比较表明，对于混合物中高分子量组分链，作为溶剂的链松弛部分的完整dtd图在中间时间失效。这种失败与该链的纠缠段的约束释放（CR）平衡不足有关。适当考虑这种CR平衡的部分dtd图成功地描述了共混物的线性弛豫行为。为了证明在平衡和非平衡状态下比较PI的介电和粘弹性性能的有效性，还介绍了PI在快速流动下受流动激活的CR/DTD机制影响的介电和粘弹性性能。
This article gives a review of the results of recent dielectric and viscoelastic studies for entangled binary blends of linear cis-polyisoprenes to explain the current understanding of the equilibrium entanglement dynamics on the basis of the molecular picture of dynamic tube dilation (DTD). Comparison of dielectric and viscoelastic properties reveals that the full-DTD picture regarding the relaxed portions of the chains as a solvent fails for the high molecular weight component chain in the blends at intermediate times. This failure is related to insufficient constraint release (CR) equilibration of the entanglement segments of this chain. A partial-DTD picture properly considering this CR equilibration successfully describes the linear relaxation behavior of the blends. The dielectric and viscoelastic properties of PI under fast flow, being affected by the flow-activated CR/DTD mechanism, are also presented in order to demonstrate the usefulness of the comparison of these properties in both equilibrium and non-equilibrium states.