Two-Step Ethylene Slurry Polymerization with Magnesium Dichloride-Supported Titanium Catalyst

IF 1 4区 化学 Q4 POLYMER SCIENCE
Sanket Shah, Maharshi Gajjar, Harshad R. Patil, Virendrakumar Gupta
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引用次数: 0

Abstract

High-density polyethylene (HDPE) was synthesized using a Ziegler-Natta catalyst in two different ways: one step and two-step processes in a hexane slurry polymerization. The study explored the impact of adding hydrogen as a chain-terminating agent on various properties of the polymer, such as productivity of catalyst, molecular weight distribution variation, melt flow index (MFI) and resin average particle size distribution. The results revealed that increasing hydrogen concentrations led to the production of low-molar mass and high MFI polyethylene in the one-step process. Conversely, decreasing hydrogen concentration and increasing ethylene concentration produced higher molar mass/low MFI polyethylene in the same one-step process. In the two-step process, low-molar mass PE was formed first, followed by high-molar mass PE, resulting in broad molecular weight distribution (MWD). This research provides insights into controlling the molecular weight of polyethylene in slurry polymerization processes, which is significant for industrial polymerization technology.

Abstract Image

以二氯化镁为载体的钛催化剂进行两步乙烯浆料聚合反应
使用齐格勒-纳塔催化剂以两种不同的方式合成了高密度聚乙烯(HDPE):正己烷浆料聚合中的一步法和两步法。研究探讨了添加氢作为链终止剂对聚合物各种特性的影响,如催化剂的生产率、分子量分布变化、熔体流动指数(MFI)和树脂平均粒度分布。研究结果表明,在一步法工艺中,增加氢浓度可生产出低摩尔质量和高 MFI 的聚乙烯。相反,在相同的一步法工艺中,降低氢浓度和增加乙烯浓度可生产出摩尔质量较高/MFI 较低的聚乙烯。在两步法工艺中,先形成低摩尔质量聚乙烯,然后形成高摩尔质量聚乙烯,从而导致宽分子量分布(MWD)。这项研究为控制浆料聚合过程中聚乙烯的分子量提供了见解,对工业聚合技术具有重要意义。
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来源期刊
Polymer Science, Series B
Polymer Science, Series B 化学-高分子科学
CiteScore
1.80
自引率
8.30%
发文量
58
审稿时长
>0 weeks
期刊介绍: Polymer Science, Series B is a journal published in collaboration with the Russian Academy of Sciences. Series B experimental and theoretical papers and reviews dealing with the synthesis, kinetics, catalysis, and chemical transformations of macromolecules, supramolecular structures, and polymer matrix-based composites (6 issues a year). All journal series present original papers and reviews covering all fundamental aspects of macromolecular science. Contributions should be of marked novelty and interest for a broad readership. Articles may be written in English or Russian regardless of country and nationality of authors. All manuscripts are peer reviewed
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