Ziegler-Natta (ZN) based co-polymerization processes for the production of linear low-density polyethylene (LLDPE) generally give rise to a non-uniform incorporation distribution of the comonomer. It has been shown that lowering the titanation temperature during catalyst synthesis can increase the evenness of this distribution. However, polymerization process parameters also affect the resulting incorporation distribution. To investigate these factors, a ZN system using a variety of comonomer-types, at various -concentrations and polymerization temperatures is studied. The molecular properties of the polymer samples obtained are analyzed by high-temperature size-exclusion chromatography (HT-SEC). It is shown that a more uniform incorporation distribution of the comonomer can be achieved by lowering either the polymerization temperature or the comonomer concentration, and that lowering both increases the effect.

中文翻译：

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齐格勒-纳塔催化中聚合工艺参数对改进共聚单体掺入行为的影响

用于生产线性低密度聚乙烯 (LLDPE) 的基于齐格勒-纳塔 (ZN) 的共聚工艺通常会导致共聚单体的掺入分布不均匀。已经表明，在催化剂合成过程中降低钛化温度可以增加这种分布的均匀性。然而，聚合工艺参数也会影响所得的掺入分布。为了研究这些因素，研究了在不同浓度和聚合温度下使用多种共聚单体类型的 ZN 体系。通过高温尺寸排阻色谱 (HT-SEC) 分析获得的聚合物样品的分子性质。