Ethylene/1-Hexene Copolymerization with Modified Ziegler-Natta Catalyst

作     者：YIN Meng ZHANG Zhiqiang XIONG Yujie LIU Min ZHANG Yan MI Puke 

作者机构：Key Laboratory for Ultrafine MaterialsMinistry of EducationShanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237P.R.China 

出 版 物：《Chemical Research in Chinese Universities》 (高等学校化学研究（英文版）)

年 卷 期：2019年第35卷第6期

页      面：1089-1094页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：Supported by the National Key R&D Program of China the PetroChina Innovation Foundation 

主　　题：Ziegler-Natta catalyst Internal donor Lewis base Ethylene-olefin copolymerization Copolymer structure 

摘      要：Siloxane compounds were treated with the compounds containing internal donors,such as aromatic ester,phosphate,or 1,3-diether compounds,and the resulting intermediates were further reacted with TiCl4 to form the modified Ziegler-Natta catalysts for ethylene/1-hexene(E-H)*** the modified Ziegler-Natta catalysts,the effect of the internal donors and the molar ratio of alcohol to magnesium on the catalyst performance was investigated by the orthogonal *** synthetic method of the catalysts was also optimized by choosing the proper way to mix the internal *** branch degree,sequence structure,molecular weight,and molecular weight distribution of the copolymer products were determined by Fourier transform infrared spectroscopy(FTIR),carbon-13 nuclear magnetic resonance(^13C NMR)spectrometry and gel permeation chromatography(GPC).Under the optimum conditions,the catalytic system with tetraethyl orthosilicate and 2,2-dimethoxypropane as the internal donors exhibited the best performance with an activity of 926.74 g copolymer/(g Cat·h^?1).The branch degree,1-hexene content,and molecular weight distribution of the resulting copolymers reached up to 40 branches/1000C,5.99%and 5.8,respectively.