Modified methylaluminoxane and alkylaluminum activated nd (vers)(3) catalyst for isoprene polymerization
文献类型：期刊论文
| 作者 | Li, GL; Dong, WM; Jiang, LS; Zhang, XQ; Wang, FS |
| 刊名 | Chinese journal of catalysis
 |
| 出版日期 | 2005-10-01 |
| 卷号 | 26期号:10页码:879-883 |
| 关键词 | Versatate Neodymium Alkyl aluminum Aluminoxane Isoprene Polyisoprene |
| ISSN号 | 0253-9837 |
| 通讯作者 | Dong, wm() |
| 英文摘要 | The nd(vers)(3) catalyst activated by modified methylaluminoxane (mmao, in heptane) and alkylaluminum (air(3)) was applied in isoprene (ip) polymerization. nd(vers)(3)-mmao catalyst is able to polymerize isoprene, while a large amount of mmao (n (mmao) /n (nd) = 40) is necessary. when air(3) partially substitutes for mmao, the activity of nd(vers)3-mmao increases significantly at a relatively low mmao amount (n (mmao) /n (nd) = 20, n (ai) /n (nd) = 40). however, the cis-1, 4 unit content of the polyisoprene is low (ca. 90%). al (i-bu)(2)cl improves the cis-1,4 stereospecificity (up to 95%) of the nd(vers)(3)-mmao catalyst, while a large amount of mmao (n (mmao)/n (nd) = 40) is consumed as cocatalyst. the nd(vers)(3)-mmao-al(i-bu)(2)h catalyst with chlorine compounds, such as al(i-bu)(2)cl, alet2cl, mesicl3, sicl4 or t-bucl, is able to form a homogeneous catalyst system with high stability in the presence of a small amount of ip (n (ip)/n (nd) = 10). the catalyst system with al(i-bu)(2)cl, for instance, is highly effective in ip polymerization at a relatively low mmao amount ( n (mmao) /n (nd) = 15, 77 (al) /n (nd) = 30) and broad range of al(i-bu)(2)cl amount ( n (cl)/n (nd) = 0.5 similar to 7.0). the catalyst activity is higher than nd(vers)(3)-mmao-al(i-bu)(2)h and nd(vers)(3)-al(i-bu)(2)h-al(i-bu)(2)cl, and a high cis-1,4 content up to 96% of polyisoprene is achieved. the molecular weight of polyisoprene can be controlled by adjusting mmao and ai(i-bu)2h amounts. the generation process of the catalyst active species was speculated primarily. |
| WOS关键词 | 1,3-BUTADIENE ; BUTADIENE ; CHLORIDE ; SYSTEMS ; MAO |
| WOS研究方向 | Chemistry ; Engineering |
| WOS类目 | Chemistry, Applied ; Chemistry, Physical ; Engineering, Chemical |
| 语种 | 英语 |
| WOS记录号 | WOS:000233264100013 |
| 出版者 | SCIENCE PRESS |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2377277 |
| 专题 | 中国科学院大学 |
| 通讯作者 | Dong, WM |
| 作者单位 | 1.Chinese Acad Sci, Changchun Inst Appl Chem, Changchun 130022, Jilin, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, GL,Dong, WM,Jiang, LS,et al. Modified methylaluminoxane and alkylaluminum activated nd (vers)(3) catalyst for isoprene polymerization[J]. Chinese journal of catalysis,2005,26(10):879-883. |
| APA | Li, GL,Dong, WM,Jiang, LS,Zhang, XQ,&Wang, FS.(2005).Modified methylaluminoxane and alkylaluminum activated nd (vers)(3) catalyst for isoprene polymerization.Chinese journal of catalysis,26(10),879-883. |
| MLA | Li, GL,et al."Modified methylaluminoxane and alkylaluminum activated nd (vers)(3) catalyst for isoprene polymerization".Chinese journal of catalysis 26.10(2005):879-883. |
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来源：中国科学院大学
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