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首页> 外文期刊>Macromolecular symposia >Evidences of Long-Chain Branching in Ziegler-Natta Polyethylene Homopolymers as Studied via SEC-MALS and Rheology
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Evidences of Long-Chain Branching in Ziegler-Natta Polyethylene Homopolymers as Studied via SEC-MALS and Rheology

机译：通过SEC-MALS和流变学研究的齐格勒-纳塔聚乙烯均聚物中长链支化的证据

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摘要

Comprehensive polymer architectural studies were carried out on a group of Ziegler-Natta (Z-N) polyethylene homopolymers via size-exclusion chromatography coupled with multi-angle light scattering (SEC-MALS) and rheology. Although Z-N resins are traditionally viewed as linear polymers, both SEC-MALS and rheology results strongly indicate that there are topological variations, presumably long-chain branching (LCB) or possibly hyper-branches, in this group of supposedly linear Z-N homopolymers. These Z-N homopolymers exhibit very complex elution behavior that resulted in anomalous elution profiles in SEC. It appeared that some high molecular weight (MW) and long-chain branched components followed a nonsize exclusion separation mechanism on SEC columns, co-eluting with low MW and linear polyethylene components, causing a delayed elution. The possible origin of LCB in these Z-N polymers is also discussed.
机译：通过尺寸排阻色谱法结合多角度光散射（SEC-MALS）和流变学，对一组齐格勒-纳塔（Z-N）聚乙烯均聚物进行了全面的聚合物结构研究。尽管传统上将Z-N树脂视为线性聚合物，但SEC-MALS和流变学结果均强烈表明，在这组假定为线性的Z-N均聚物中，存在拓扑变化，可能是长支链（LCB）或可能是超支化。这些Z-N均聚物表现出非常复杂的洗脱行为，导致SEC中的洗脱异常。似乎某些高分子量（MW）和长链支化组分在SEC色谱柱上遵循无尺寸排阻分离机制，与低MW和线性聚乙烯组分共洗脱，导致洗脱延迟。还讨论了这些Z-N聚合物中LCB的可能来源。

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