Ligand-Free Magnesium Catalyst System: Immortal Polymerization of L-Lactide with High Catalyst Efficiency and Structure of Active Intermediates
文献类型：期刊论文
| 作者 | Wang Y ; Zhao W ; Liu XL ; Cui DM ; Chen EYX |
| 刊名 | macromolecules
 |
| 出版日期 | 2012 |
| 卷号 | 45期号:17页码:6957-6965 |
| 关键词 | RING-OPENING POLYMERIZATION N O MULTIDENTATE LIGANDS GROUP-3 METAL-COMPLEXES CYCLIC ESTERS EPSILON-CAPROLACTONE RAC-LACTIDE ALUMINUM COMPLEXES BULK-POLYMERIZATION RACEMIC LACTIDE TRIMETHYLENE CARBONATE |
| ISSN号 | 0024-9297 |
| 通讯作者 | cui dm |
| 中文摘要 | a simple, inexpensive, and convenient catalyst system consisting of supporting ligand-free (mgbu2)-bu-n in combination with an alcohol, isopropanol ((proh)-pr-i), benzyl methanol (phch2oh), diphenylmethanol (ph2choh), or triphenylmethanol (ph3coh), generates a convenient catalyst system to promote the polymerization of l-la. in particular, the binary system (mgbu2)-bu-n/ph2choh demonstrates an unprecedentedly high activity in the presence of a large excess amount of ph2choh with the [oh](0)/[mg](0) ratio varying from 2 to 500, producing up to 500 polylactide (pla) chains per mg center and thus showing a typical nature of immortal polymerization. the molecular weights of the obtained plas with a broad range of monomer-to-metal ratios ([l-la](0)/[mg](0) = 200-5000) are rather accurately controlled by the ph2choh loading, relative to [mg](0), while the molecular weight distributions remain nearly constant with polydispersity index (pdi) = 1.08-1.18. moreover, the active polymerization intermediate has been isolated from the stoichiometric reaction between (mgbu2)-bu-n and ph2choh and structurally characterized as a tetranuclear complex, mg-4(ph2cho)(8)(thf)(2) (1). complex 1 remains the tetranuclear structure in solution or in the presence of excess ph2choh as determined by 2d dosy. on the basis of structural information about the active intermediates and polymerization kinetics, a coordination insertion polymerization mechanism is proposed. |
| 收录类别 | SCI收录期刊论文 |
| 语种 | 英语 |
| WOS记录号 | WOS:000309014000023 |
| 公开日期 | 2013-04-23 |
| 源URL | [http://ir.ciac.jl.cn/handle/322003/47948]  |
| 专题 | 长春应用化学研究所_长春应用化学研究所知识产出_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang Y,Zhao W,Liu XL,et al. Ligand-Free Magnesium Catalyst System: Immortal Polymerization of L-Lactide with High Catalyst Efficiency and Structure of Active Intermediates[J]. macromolecules,2012,45(17):6957-6965. |
| APA | Wang Y,Zhao W,Liu XL,Cui DM,&Chen EYX.(2012).Ligand-Free Magnesium Catalyst System: Immortal Polymerization of L-Lactide with High Catalyst Efficiency and Structure of Active Intermediates.macromolecules,45(17),6957-6965. |
| MLA | Wang Y,et al."Ligand-Free Magnesium Catalyst System: Immortal Polymerization of L-Lactide with High Catalyst Efficiency and Structure of Active Intermediates".macromolecules 45.17(2012):6957-6965. |
入库方式： OAI收割
来源：长春应用化学研究所
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