Effects of Prepolymerization, Temperature, and Hydrogen Concentration on Kinetics of Propylene Bulk Polymerization Using a Commercial Ziegler-Natta Catalyst

IF 2 4区工程技术 Q3 ENGINEERING, CHEMICAL

Advances in Polymer Technology Pub Date : 2022-10-10 DOI:10.1155/2022/9980759

Huiyue Liu, Gaiping Du, Yafeng Du, Dezhan Li, Jiangbo Chen

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引用次数: 1

Abstract

The effects of prepolymerization, temperature, and hydrogen concentration on propylene bulk polymerization with a commercial Ziegler-Natta catalyst were investigated, and the apparent polymerization rate constants were estimated by varying reaction temperatures, hydrogen partial pressures, and polymerization methods. It was shown that prepolymerization has different effects on the polymerization rate and isotacticity of the polymer; without prepolymerization, the polymerization rate and isotacticity reach their maximum at 70°C and 80°C, respectively, whereas the polymerization rate and isotacticity with prepolymerization increase with the polymerization temperature in the range of 50-80°C. Moderate prepolymerization time reduced the fine fraction while increasing polymerization rate and isotacticity. Appropriate prepolymerization technique can increase mass transfer performance and fragmentation, which is a promising way to improve polymerization rate, isotacticity index, and fine fraction. Otherwise, insufficient prepolymerization or excessive prepolymerization causes prepolymer particle fragmentation.

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预聚合、温度和氢浓度对商用Ziegler-Natta催化剂丙烯本体聚合动力学的影响

研究了预聚合、温度和氢浓度对商用Ziegler-Natta催化剂丙烯本体聚合的影响，并通过不同的反应温度、氢分压和聚合方法估算了表观聚合速率常数。结果表明，预聚合对聚合物的聚合速率和等规性有不同程度的影响;未进行预聚合时，聚合速率和等规性分别在70℃和80℃达到最大值，而在50 ~ 80℃范围内，预聚合时聚合速率和等规性随聚合温度的升高而升高。适度的预聚合时间降低了细粒分数，提高了聚合速率和等规性。适当的预聚合技术可以提高聚合物的传质性能和破碎性，是提高聚合速率、等规指数和细粒率的有效途径。否则，预聚合不足或过度预聚合会导致预聚物颗粒破碎。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Polymer Technology 工程技术-高分子科学

CiteScore

5.50

自引率

0.00%

发文量

审稿时长

9 months

期刊介绍： Advances in Polymer Technology publishes articles reporting important developments in polymeric materials, their manufacture and processing, and polymer product design, as well as those considering the economic and environmental impacts of polymer technology. The journal primarily caters to researchers, technologists, engineers, consultants, and production personnel.