Investigation of Chain Microstructure of Polypropylene Polymerized by Ziegler–Natta Catalysts with Diester and Diether Compound as Internal Donor via Hydrogen Chain Transfer,Industrial & Engineering Chemistry Research

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Investigation of Chain Microstructure of Polypropylene Polymerized by Ziegler–Natta Catalysts with Diester and Diether Compound as Internal Donor via Hydrogen Chain Transfer
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2020-01-27 , DOI: 10.1021/acs.iecr.9b05888
Xuemin Yin _{1,

2} , Yawei Qin _{1,

2} , Jin-Yong Dong _{1,

2}

Affiliation

Two series of polypropylene samples (PP) were prepared with two MgCl₂/TiCl₄-type catalysts with diisobutyl phthalate and 9,9-bis(methoxymethyl)fluorine as internal donors (named as cat1 and cat2), respectively, at different hydrogen dosages. The results show that the molecular weights and microstructures of polypropylene were affected by the dosages of hydrogen, which acted as a chain transfer agent in propylene polymerization. For the two catalysts, the molecular weights of polypropylene had an exponential relationship with the hydrogen dosages, to which the total defect contents and lamellar thicknesses (L_n) however showed a linear dependency, indicating that hydrogen exerted similar effects on the above polypropylene properties. However, there were differences in the linear relationships of mmmm contents and the hydrogen dosages for the two catalysts. Moreover, the linear relationship between the lamellar thickness (L₁) of PP prepared with the two catalysts and hydrogen content is also different. It was suggested that for different catalysts of different internal donors the hydrogen chain transfer followed different patterns in affecting polypropylene properties. Our results provide guidelines to obtain special quality polypropylene by hydrogen chain transfer.

中文翻译：

季格勒-纳塔催化剂以二酯和二醚化合物为内给体聚合的聚丙烯链微结构的氢链转移研究

用两种邻苯二甲酸二异丁酯和9,9-双（甲氧基甲基）氟作为内给体（分别称为cat1和cat2）的两种MgCl ₂ / TiCl ₄型催化剂制备了两个系列的聚丙烯样品（PP ），分别使用了不同的氢气剂量。结果表明，聚丙烯的分子量和微观结构受氢的加入量的影响，氢的加入是丙烯聚合中的链转移剂。对于这两种催化剂，聚丙烯的分子量与氢的用量呈指数关系，总缺陷含量和层厚度（L _n）然而显示出线性依赖性，表明氢对上述聚丙烯性能具有相似的作用。然而，两种催化剂的mmmm含量和氢剂量的线性关系存在差异。而且，用两种催化剂制备的PP的层状厚度（L ₁）与氢含量之间的线性关系也不同。建议对于不同内部供体的不同催化剂，氢链转移在影响聚丙烯性能方面遵循不同的模式。我们的结果为通过氢链转移获得特殊质量的聚丙烯提供了指导。

更新日期：2020-01-29

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