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The use of rheology to detect and examine the degradation of polyethylene during processing

机译：使用流变学检测和检查加工过程中聚乙烯的降解

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摘要

Rheology is among the more sensitive tools used to detect the effects of degradation. The melt viscosity of polymers is very sensitive to changes in the weight-average molecular weight, which in turn is particularly sensitive to changes in the higher molecular weight portion of the molecular weight distribution. The effect of chain scission is therefore easily detected as a decrease in the melt viscosity. The melt viscosity is even more sensitive to very small numbers of long-chain branches that may be created during degradation. Both chain scission and long-chain branching can occur during melt processing and the combined effect is what is detected rheologically. For most polyethylene resins of commercial interest, the dynamic rheometer is a sensitive and versatile choice to monitor degradation processes. This paper demonstrates the use of the dynamic rheometer to study the stability of various types of polyethylene resins. Applications using this methodology are briefly outlined and insights from these studies are shared.
机译：流变学是用于检测退化影响的更敏感的工具之一。聚合物的熔体粘度对重均分子量的变化非常敏感，这又对分子量分布的较高分子量部分的变化特别敏感。因此，断链的影响很容易检测为熔融粘度的降低。熔体粘度对降解过程中可能产生的极少数长链支链更为敏感。在熔体加工过程中都可能发生断链和长链支化，流变学上可以检测到这种综合作用。对于大多数商业上感兴趣的聚乙烯树脂，动态流变仪是监测降解过程的灵敏且多功能的选择。本文演示了使用动态流变仪研究各种类型的聚乙烯树脂的稳定性。简要概述了使用这种方法的应用，并分享了这些研究的见解。

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