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首页> 外文期刊>Journal of Applied Polymer Science >NEW MEASURES OF POLYDISPERSITY FROM RHEOLOGICAL DATA ON POLYMER MELTS
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NEW MEASURES OF POLYDISPERSITY FROM RHEOLOGICAL DATA ON POLYMER MELTS

机译：聚合物熔体流变学数据的新方法

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摘要

The rheological properties of polymer melts depend strongly on the underlying molecular structure: molecular weight, molecular weight distribution, and long chain branching. It is of considerable importance, both fundamental and practical, to relate the molecular architecture to polymer melt theology. The focus of the present work is in extracting a measure of polydispersity from theological data. Various polydispersity measures that have been proposed in the literature are critically examined and their limitations are pointed out. New measures of polydispersity are proposed that overcome these limitations. The evaluation of the various polydispersity measures is performed by reference to theology fundamentals, with model calculations and examples drawn from industrial practice. The issues of eliminating molecular weight and temperature effects in characterizing polydispersity are comprehensively addressed. The presence of small levels of long chain branching in an otherwise linear polymer alters most of these measures of polydispersity dramatically, while no detectable change appears in the molecular weight distribution obtained using a gel permeation chromatograph. It is demonstrated that the polydispersity measures proposed in the present work, and which are extracted from frequency response data in the linear viscoelastic region, can be used reliably to characterize polydispersity in polymer melts. (C) 1995 John Wiley & Sons, Inc. [References: 35]
机译：聚合物熔体的流变特性在很大程度上取决于基本的分子结构：分子量，分子量分布和长链支化。将分子结构与聚合物熔体神学联系起来在基础和实践上都具有相当重要的意义。本工作的重点是从神学数据中提取多分散性的量度。严格审查了文献中提出的各种多分散性措施，并指出了它们的局限性。提出了克服这些限制的新的多分散性度量。各种多分散性度量的评估是参考神学基础知识，模型计算和从工业实践中得出的示例进行的。全面解决了消除表征多分散性的分子量和温度影响的问题。否则，线性聚合物中少量长链支链的存在会极大地改变大多数这些多分散性的指标，而使用凝胶渗透色谱仪测得的分子量分布则没有可检测到的变化。结果表明，从线性粘弹性区域的频率响应数据中提取的本论文中提出的多分散性测量方法可以可靠地用于表征聚合物熔体中的多分散性。 （C）1995 John Wiley＆Sons，Inc. [参考：35]

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