ICCAS OpenIR
Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene
Cui, Y; Shao, CX; Sun, WH
2003-07-01
Source PublicationCENTRAL EUROPEAN JOURNAL OF CHEMISTRY
ISSN1644-3624
Volume1Issue:4Pages:325-338
AbstractThe polymerization behavior of 2-(2'-pyridyl) quinoxaline nickel dibromide/Cp2ZrCl2/MAO system was investigated in three ways: the Ni catalyst was added first, followed by addition of Zr catalyst (method I); the Ni and Zr catalysts were added simultaneously (method II); and the Zr catalyst was added first, followed by addition of Ni catalyst (method III). Results of GC-MS, GPC, C-13 NMR and DSC investigations indicated that the properties of resulting polyethylene were greatly varied by changing feeding orders of the two catalysts. Decreasing Ni/Zr molar ratio or increasing polymerization temperature gave corresponding polyethylenes with less branches and higher melting point. Compared to the procedure using Cp2ZrCl2 catalyst only, the activity of Zr catalyst in those combined system decreased because of the competition of ethylene between the [Ni-C] and [Zr-C] active centers. In addition, other zirconocenes were also employed as copolymerization catalysts in the combined system with nickel complex. Compared to Cp2ZrCl2 case, the ethyl-bridged Zr catalyst performed better for polymerization of ethylene while the Si-bridged Zr catalyst showed better copolymerization ability. (C) Central European Science Journals. All rights reserved.
KeywordCopolymerization 2-(2 '-pyridyl)Quinoxaline Nickel Dibromide Cp2zrcl2 Branched Polyethylene
Indexed BySCI
Language英语
WOS IDWOS:000222187300001
PublisherCENTRAL EUROPEAN SCIENCE JOURNALS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/79900
Collection中国科学院化学研究所
Corresponding AuthorCui, Y
Affiliation1.Chinese Acad Sci, Inst Chem, State Key Lab Engn Plast, Beijing 100080, Peoples R China
2.Chinese Acad Sci, Inst Chem, Ctr Mol Sci, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Cui, Y,Shao, CX,Sun, WH. Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene[J]. CENTRAL EUROPEAN JOURNAL OF CHEMISTRY,2003,1(4):325-338.
APA Cui, Y,Shao, CX,&Sun, WH.(2003).Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene.CENTRAL EUROPEAN JOURNAL OF CHEMISTRY,1(4),325-338.
MLA Cui, Y,et al."Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene".CENTRAL EUROPEAN JOURNAL OF CHEMISTRY 1.4(2003):325-338.
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