Regio-chemistry control in propylene/isoprene copolymerization by metallocene catalysts
文献类型：期刊论文
| 作者 | Niu, Hui1,2; Dong, Jin-Yong1 |
| 刊名 | POLYMER INTERNATIONAL
 |
| 出版日期 | 2015-08-01 |
| 卷号 | 64期号:8页码:1023-1029 |
| 关键词 | propylene isoprene copolymerization metallocene catalyst regio-chemistry |
| 英文摘要 | Regio-chemistry control in copolymerization of propylene with isoprene is pursued with C-2-symmetric ansa-metallocene catalysts in order to efficiently synthesize isotactic polypropylene bearing pendant vinylidene functionality (iPP-g-VD) using isoprene as a convenient asymmetric diene feedstock. Two paths are taken by employing two well-known but structurally different metallocenes that exhibit discrepant regio-chemistry for -olefin insertion, namely rac-Me2Si(2-Me-4-Ph-Ind)(2)ZrCl2 (1) and rac-CH2(3-t-Bu-Ind)(2)ZrCl2 (2), both of which tend to an improvement of isoprene 4,3- (primary) insertion specificity whilst depressing the regio-reversed 3,4- (secondary) insertion. In the case of using 1-methylaluminoxane (MAO), the strategy is to use increased dosage of H-2 to effectively integrate isoprene 3,4-insertion into iPP main chain without developing -allyl-metal deadlock. In the case of using 2-MAO, however, the sterically highly hindered ligand structure only accommodates primary isoprene 4,3-insertion. Synthesis of iPP-g-VD becomes much more controllable, with up to 1.91 mol% of side-chain vinylidene groups having been realized on iPP, at fairly good catalyst activities and little or no sacrifice of polymer molecular weight. iPP-g-VD is revealed to be fully eligible as an intermediate for accessing polar-functionalized polypropylene, with both hydroboration and subsequent hydroxylated functionalization and poly(methyl methacrylate) grafting proceeding with high yields. (c) 2015 Society of Chemical Industry |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2015-11-02 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/27941]  |
| 专题 | 化学研究所_工程塑料实验室 |
| 作者单位 | 1.Chinese Acad Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China 2.Dalian Univ Technol, Sch Chem Engn, Dept Polymer Sci & Engn, State Key Lab Fine Chem, Dalian 116024, Peoples R China |
| 推荐引用方式 GB/T 7714 | Niu, Hui,Dong, Jin-Yong. Regio-chemistry control in propylene/isoprene copolymerization by metallocene catalysts[J]. POLYMER INTERNATIONAL,2015,64(8):1023-1029. |
| APA | Niu, Hui,&Dong, Jin-Yong.(2015).Regio-chemistry control in propylene/isoprene copolymerization by metallocene catalysts.POLYMER INTERNATIONAL,64(8),1023-1029. |
| MLA | Niu, Hui,et al."Regio-chemistry control in propylene/isoprene copolymerization by metallocene catalysts".POLYMER INTERNATIONAL 64.8(2015):1023-1029. |
入库方式： OAI收割
来源：化学研究所
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