文献类型：期刊文献

中文题名：Ethylene/1-Hexene Copolymerization with Modified Ziegler-Natta Catalyst

英文题名：Ethylene/1-Hexene Copolymerization with Modified Ziegler-Natta Catalyst

作者：Yin Meng[1];Zhang Zhiqiang[1];Xiong Yujie[1];Liu Min[1];Zhang Yan[1];Mi Puke[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China

年份：2019

卷号：35

期号：6

起止页码：1089

中文期刊名：Chemical Research in Chinese Universities

外文期刊名：CHEMICAL RESEARCH IN CHINESE UNIVERSITIES

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000507481200026)】；CSCD:【CSCD2019_2020】；

基金：Supported by the National Key R&D Program of China(No.2017YFB0306701) and the PetroChina Innovation Foundation(No.2014D-5006-0504).

语种：英文

中文关键词：Ziegler-Natta;catalyst;Internal;donor;Lewis;base;Ethylene-olefin;copolymerization;Copolymer;structure

外文关键词：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)copolymerization.Using 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 experiments.The synthetic method of the catalysts was also optimized by choosing the proper way to mix the internal donors.The 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.
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) copolymerization. Using 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 experiments. The synthetic method of the catalysts was also optimized by choosing the proper way to mix the internal donors. The 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(C-13 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.