Polymerization Kinetics and Microstructure of Ethylene/1‐Hexene Copolymers Made with Dual Metallocenes,Macromolecular Reaction Engineering

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Polymerization Kinetics and Microstructure of Ethylene/1‐Hexene Copolymers Made with Dual Metallocenes
Macromolecular Reaction Engineering ( IF 1.8 ) Pub Date : 2019-11-22 , DOI: 10.1002/mren.201900032
Sahar Saadat ₁ , João B. P. Soares ₁ , Paul J. DesLauriers ₂ , Jeff S. Fodor ₂

Affiliation

Mathematical models are developed to describe the polymerization of ethylene and 1‐hexene with a constrained geometry catalyst (CGC‐Ti) and with bis(cyclopentadienyl)‐zirconium (IV) dichloride (Cp₂ZrCl₂). Particle swarm optimization is used to fit these models to homo‐ and copolymerization data. The models are also used to describe copolymerizations with mixtures of CGC‐Ti and Cp₂ZrCl₂ to make copolymers with inverse short chain branching distribution. Copolymer molecular weight and short chain branch distributions, as well as polymerization rates with the dual metallocene system, are measured to test whether they agreed with model predictions. The results show that the two metallocenes do not interact strongly when used as a mixture to make ethylene/1‐hexene copolymers.

中文翻译：

双茂金属制乙烯/ 1-己烯共聚物的聚合动力学和微观结构

建立了数学模型来描述乙烯和1-己烯与受限几何催化剂（CGC-Ti）以及双（环戊二烯基）-锆（IV）二氯化物（Cp ₂ ZrCl ₂）的聚合。粒子群优化用于使这些模型适合均聚和共聚数据。该模型还用于描述与CGC-Ti和Cp ₂ ZrCl _2的混合物共聚制备具有反向短支链分布的共聚物。测量共聚物的分子量和短链分支分布，以及双金属茂体系的聚合速率，以测试它们是否与模型预测一致。结果表明，两种茂金属作为混合物用于制备乙烯/ 1-己烯共聚物时，相互作用不强。

更新日期：2019-11-22

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