Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts
文献类型：期刊论文
| 作者 | Yao, H; Xiao, SJ |
| 刊名 | CHINESE JOURNAL OF POLYMER SCIENCE
 |
| 出版日期 | 2000-03-01 |
| 卷号 | 18期号:2页码:169-175 |
| 关键词 | Metallocene Catalyst Ethylene/propylene Copolymerization Methylaluminoxane |
| ISSN号 | 0256-7679 |
| 英文摘要 | (CpCH2CH2CH = CH2)(2)MCl2(M = Zr, Hf)/MAO and Cp2ZrCl2/MAO (Cp = cyclopentadienyl; MAO = methylaluminoxane) catalyst systems have been compared for ethylene copolymerization to investigate the influence of the ligand and transition metal on the polymerization activity and copolymer properties. For both CH2CH2CH = CH2 substituted catalysts the catalytic activity decreased with increasing propene concentration in the feed. The activity of the hafnocene catalyst was 6 similar to 8 times lower than that of the analogous zirconocene catalyst, C-13 NMR analysis showed that the copolymer obtained using the unsubstituted catalyst Cp2ZrCl2, has greater incorporatien of propene than those produced by CH2CH2,CH = CH2 substituted Zr and Hf catalysts. The melting point, crystallinity and the viscosity-average molecular weight of the copolymer decreased with an increase of propene concentration in the feed. Both CH2CH2CH = CH2 substituted Zr and Hf catalysts exhibit little or no difference in the melting point and crystallinity of the produced copolymers. However, there are significant differences between the two zirconocene catalysts. The copolymer produced by Cp2ZrCl2 catalyst have much lower T-m and X-c than those obtained with the (CpCH2CH2CH = CH2)(2)ZrCl2 catalyst. The density and molecular weight of the copolymer decreased in the order: (CpCH2CH2CH = CH2)(2)HfCl2>(CpCH2CH2CH = CH2)(2)ZrCl2>Cp2ZrCl2. The kinetic behavior of copolymerizaton with Hf catalyst was found to be different from that with Zr catalyst. |
| 语种 | 英语 |
| WOS记录号 | WOS:000085850700012 |
| 出版者 | SPRINGER-VERLAG SINGAPORE PTE LTD |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/76063]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Xiao, SJ |
| 作者单位 | Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yao, H,Xiao, SJ. Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts[J]. CHINESE JOURNAL OF POLYMER SCIENCE,2000,18(2):169-175. |
| APA | Yao, H,&Xiao, SJ.(2000).Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts.CHINESE JOURNAL OF POLYMER SCIENCE,18(2),169-175. |
| MLA | Yao, H,et al."Copolymerization of ethylene and propylene with (CpCH2CH2CH = CH2)(2)MCl2 (M = Zr, Hf) and Cp2ZrCl2 catalysts".CHINESE JOURNAL OF POLYMER SCIENCE 18.2(2000):169-175. |
入库方式： OAI收割
来源：化学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。