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Highly active ethylene polymerization and copolymerization with norbornene using bis(imino-indolide) titanium dichloride-MAO system
Zuo, Weiwei; Sun, Wen-Hua; Zhang, Shu; Hao, Peng; Shiga, Akinobu
2007-08-01
Source PublicationJOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
ISSN0887-624X
Volume45Issue:15Pages:3415-3430
AbstractA catalytic system of new titanium complexes with methylaluminoxane (MAO) was found to effectively polymerize ethylene for high molecular weight polyethylene as well as highly active copolymerization of ethylene and norbornene. The bis (imino-indolide)titanium dichlorides (L2TiCl2, 1-5), were prepared by the reaction of N-((3-chloro-1H-indol-2-yl)methylene)benzenamines with TiCl4, and characterized by elemental analysis, H-1 and C-13 NMR spectroscopy. The solid-state structures of I and 4 were determined by X-ray diffraction analysis to reveal the six-coordinated distorted octahedral geometry around the titanium atom with a pair of chlorides and ligands in cis-forms. Upon activation by MAO, the complexes showed high activity for homopolymerization of ethylene and copolymerization of ethylene and norbornene. A positive 11 comonomer effect" was observed for copolymerization of ethylene and norbornene. Both experimental observations and paired interaction orbital (PIO) calculations indicated that the titanium complexes with electron-withdrawing groups in ligands performed higher catalytic activities than those possessing electron-donating groups. Relying on different complexes and reaction conditions, the resultant polyethylenes had the molecular weights Mw in the range of 200-2800 kg/mol. The influences on both catalytic activity and polyethylene molecular weights have been carefully checked with the nature of complexes and reaction conditions. (C) 2007 Wiley Periodicals, Inc.
KeywordAddition Polymerization Cationic Polymerization Copolymerization Ethylene Polymerization Imino-indolide Norbornene Polyethylene (Pe) Titanium
DOI10.1002/pola.22094
Indexed BySCI
Language英语
WOS IDWOS:000248021700025
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/62756
Collection中国科学院化学研究所
Corresponding AuthorSun, Wen-Hua
Affiliation1.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Natl Lab Mol Sci, Beijing 100080, Peoples R China
2.LUMMOX, Res Lab, Tsukuba, Ibaraki 3050032, Japan
Recommended Citation
GB/T 7714
Zuo, Weiwei,Sun, Wen-Hua,Zhang, Shu,et al. Highly active ethylene polymerization and copolymerization with norbornene using bis(imino-indolide) titanium dichloride-MAO system[J]. JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,2007,45(15):3415-3430.
APA Zuo, Weiwei,Sun, Wen-Hua,Zhang, Shu,Hao, Peng,&Shiga, Akinobu.(2007).Highly active ethylene polymerization and copolymerization with norbornene using bis(imino-indolide) titanium dichloride-MAO system.JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY,45(15),3415-3430.
MLA Zuo, Weiwei,et al."Highly active ethylene polymerization and copolymerization with norbornene using bis(imino-indolide) titanium dichloride-MAO system".JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY 45.15(2007):3415-3430.
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