Kinetics of Ethylene Polymerization and Regulation of Molecular Weight with ZnCl2

Abstract

Abstract: The kinetics of the polymerization of ethylene has been studied at normal pressure with the highly active catalyst system TiCl₄,NdCl₃/MgCl₂/Al(C₂H₅)₃. The rate of polymerization V_P,the specific number of active centers [C^*] , the propagation rate constant k_P,the activation energy ΔE and the lifetime of growing chain Lwere obtained by a kinetics method for the polymerization of ethylene. The influence of ZnCl₂ on the polymerization of ethylene has been investigated. It has been found that ZnCl₂ is a considerably effective transfer agent. Not only it decreases the molecular weight of polyethylene, but raises the catalytic efficiency notably as well. However, at a higher ZnCl₂ concentration, the rate of polymerization was decreased.

Key words: Ethylene polymerization, Kinetics, Zinc chloride

TrendMD:

Zhao Zhenhe, Zhou Xinhua, Lu Zejian, Lu Yun, Lin Shangan . Kinetics of Ethylene Polymerization and Regulation of Molecular Weight with ZnCl₂[J]. Chem. J. Chinese Universities, 1990, 11(2): 193.

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Kinetics of Ethylene Polymerization and Regulation of Molecular Weight with ZnCl₂

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