文献类型：期刊文献

英文题名：Nickel cyclopentadienyl complexes as catalysts for ethylene polymerization

作者：Zhang, Danfeng[1];Meng, Jiangang[1];Tian, Sumin[1]

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

年份：2015

卷号：798

起止页码：341

外文期刊名：JOURNAL OF ORGANOMETALLIC CHEMISTRY

收录：;EI(收录号：20152300902678);WOS:【SCI-EXPANDED(收录号:WOS:000366155600008)】；

基金：This work was sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry of China, and the Science and Technology Innovation Program of the China National Petroleum Corporation. Authors are in debts to Prof. Xiaochun Tao (East China University of Science and Technology) for kind discussion on the complexes syntheses, and Prof. Huanting Wang (Department of Chemical Engineering, Monash University) for his favorable suggestions on the English language of the manuscript.

语种：英文

外文关键词：Late transition metal catalyst; Ethylene polymerization; Nickel cyclopentadienyl complex

摘要：Nickel cyclopentadienyl phenyl phosphine complexes CpNi(Ph) (PPh3) (Cp = cyclopentadienyl, and iminoaryl-substituted cyclopentadienyl) are used as catalysts for ethylene polymerization in the presence of methylaluminoxane (MAO). The catalytic performances were studied under a variety of reaction conditions in which Al/Ni molar ratio, ethylene pressure, temperature, time and catalyst loading were varied. The catalytic activities and the molecular weights increase with increasing Al/Ni molar ratio and ethylene pressure. The catalysts are the thermal stable. Even at 76 degrees C, the activity reaches to 109.0 kg PE (mol Ni)(-1) h(-1) with the molecular weights of Mn = 20.6 x 10(4). The effect of the bulkiness of cyclopentadienyl ligands on ethylene polymerization was also investigated. The catalytic activities and the molecular weights of polyethylene decrease as the iminoaryl substituents are introduced into the cyclopentadienyl ring. The polymers obtained from these catalysts are linear polyethylene with 6-8 branches per thousand carbons. (C) 2015 Elsevier B.V. All rights reserved.