Rheological models based on the double reptation mixing rule: The effects of a polydisperse environment
Rheological models based on the double reptation mixing rule: The effects of a polydisperse environment
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基于双蠕动混合规则的流变模型：多分散环境的影响
DOI：
10.1122/1.551108
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发表时间：
2000
影响因子：
3.3
通讯作者：
G. Marin
中科院分区：
文献类型：
--
作者：
F. Léonardi;Jean‐Charles Majesté;A. Allal;G. Marin
我们提出了一个比较各种流变模型的基础上的双蠕动的概念，它涉及线性粘弹性数据的分子量分布，以确定最有效的方式来描述多分散性的影响。我们在这项研究中使用了两个步骤的过程。首先，我们已经进行了系统的比较，各种模型的预测与实验数据已经发表在文献中的聚苯乙烯（PS）和聚甲基丙烯酸甲酯（PMMA）的二元共混物。然后，我们比较了来自这些分子模型的复杂的剪切模量的值与流变数据上获得的“商业”多分散聚合物（PS，PMMA，和高密度聚乙烯）。结果表明，只有两个模型，明确考虑到通过“管更新”效应的大分子链的多分散周围的影响是能够正确地描述零剪切粘度和稳态顺应性的多分散性的影响。
We present a comparison of various rheological models based on the double reptation concept, which relates linear viscoelastic data to molecular-weight distribution in order to determine the most efficient way to describe polydispersity effects. We have used for this study a two-step process. First, we have performed a systematic comparison of the predictions of various models with experimental data already published in the literature for binary blends of polystyrene (PS) and polymethylmethacrylate (PMMA). Then, we have compared the values of the complex shear modulus derived from these molecular models with rheological data obtained on “commercial” polydisperse polymers (PS, PMMA, and high-density polyethylene). It is shown that only the two models which explicitly take into account the effects of the polydisperse surrounding of a macromolecular chain through “tube renewal” effects are able to describe correctly the polydispersity effects on zero-shear viscosity and steady-state compliance.