Combined polymerization catalysis of nickel complex and zirconocene for branched polyethylene
文献类型：期刊论文
| 作者 | Cui, Y; Shao, CX; Sun, WH |
| 刊名 | CENTRAL EUROPEAN JOURNAL OF CHEMISTRY
 |
| 出版日期 | 2003-07-01 |
| 卷号 | 1期号:4页码:325-338 |
| 关键词 | Copolymerization 2-(2 '-pyridyl)Quinoxaline Nickel Dibromide Cp2zrcl2 Branched Polyethylene |
| ISSN号 | 1644-3624 |
| 英文摘要 | The 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. |
| 语种 | 英语 |
| WOS记录号 | WOS:000222187300001 |
| 出版者 | CENTRAL EUROPEAN SCIENCE JOURNALS |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/79899]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Cui, Y |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：化学研究所
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