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