Rheology and microscopic topology of entangled polymeric liquids
Rheology and microscopic topology of entangled polymeric liquids
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DOI：
10.1126/science.1091215
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发表时间：
2004-02-06
期刊：
影响因子：
56.9
通讯作者：
Kremer, K
中科院分区：
文献类型：
--
作者：
Everaers, R;Sukumaran, SK;Kremer, K
高分子量聚合物液体的粘弹性质受分子尺度上的拓扑约束控制。以类似于缠绕绳索的方式，聚合物链可以滑过但不能彼此穿过。聚合物动力学和流变学的管模型是基于这样的想法，即缠结使链围绕遵循粗粒度链轮廓的原始路径发生小的波动。在这里，我们提供了这些非常成功的现象学模型的微观基础。我们分析的拓扑状态的聚合物液体的原始路径，并获得无参数，定量预测的平台模量，这与实验的所有主要类别的合成聚合物。
The viscoelastic properties of high molecular weight polymeric liquids are dominated by topological constraints on a molecular scale. In a manner similar to that of entangled ropes, polymer chains can slide past but not through each other. Tube models of polymer dynamics and rheology are based on the idea that entanglements con. ne a chain to small fluctuations around a primitive path that follows the coarse-grained chain contour. Here we provide a microscopic foundation for these highly successful phenomenological models. We analyze the topological state of polymeric liquids in terms of primitive paths and obtain parameter-free, quantitative predictions for the plateau modulus, which agree with experiment for all major classes of synthetic polymers.