In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts
文献类型：期刊论文
| 作者 | Wu, ZH ; Guo HL(郭慧龙); Guo, HL; Wu QY(吴群燕); Wang JY(王佳怡); Shi WQ(石伟群); Wu ZH(吴忠华); Bi, JF; Wu, QY; Wang, JY
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| 刊名 | RSC ADVANCES
 |
| 出版日期 | 2017 |
| 卷号 | 7期号:24页码:14413-14421 |
| ISSN号 | 2046-2069 |
| DOI | 10.1039/c7ra01249g |
| 文献子类 | Article |
| 英文摘要 | Nd-based ternary catalysts are widely used for the polymerization of isoprene in rubber industry, however structure information during the polymerization of isoprene as well as the catalytic mechanism are still ambiguous. In this paper, the in situ XAFS technique was used to extract the local atomic structure around the Nd center of the catalyst consisting of Nd(vers)(3), AlEt3, and Al(Bu-i)(2)Cl. Theoretical calculations were used to verify the structure changes in the alkylation process. Four catalysts with different alkylaluminums {AlEt3, Al((n)Oct)(3), Al(Bu-i)(3), and Al(Bu-i)(2)H} were, respectively, used for the polymerization of isoprene. The results demonstrate that the substitution of Nd-C for Nd-O bonds is reasonable in the alkylation step. The structural evolutions in the alkylation and chlorination steps, as well as in the polymerization processes of isoprene are all similar for these Nd-based ternary catalysts with different alkylaluminum components. In the polymerization process of isoprene, there are only about 2 Nd-Cl bonds at 2.85 angstrom and 1-2 Nd-C bonds at 2.42 angstrom around the Nd centers which are in a monomer state. The Nd-C bonds can be attributed to the contribution of isoprene. This highly-opened structure of the Nd active centers activates greatly the catalytic activity of the Nd-based ternary catalysts. A conjectural catalytic mechanism for the polymerization of isoprene has been deciphered on the basis of the in situ XAFS results. This study is expected to be helpful for the improvement and application of the Nd-based ternary catalysts. |
| WOS关键词 | NEODYMIUM-BASED CATALYST ; RING-OPENING POLYMERIZATION ; BUTADIENE POLYMERIZATION ; SPECTROSCOPIC METHODS ; DIENE POLYMERIZATION ; 1,3-BUTADIENE ; COMPLEXES ; REACTIVITY ; SYSTEMS ; ACID |
| WOS研究方向 | Chemistry |
| 语种 | 英语 |
| WOS记录号 | WOS:000396150900015 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/285182]  |
| 专题 | 高能物理研究所_多学科研究中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | Wu, ZH,Guo HL,Guo, HL,et al. In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts[J]. RSC ADVANCES,2017,7(24):14413-14421. |
| APA | Wu, ZH.,郭慧龙.,Guo, HL.,吴群燕.,王佳怡.,...&Jiang, SC.(2017).In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts.RSC ADVANCES,7(24),14413-14421. |
| MLA | Wu, ZH,et al."In situ X-ray absorption fine structure study on the polymerization of isoprene assisted by Nd-based ternary catalysts".RSC ADVANCES 7.24(2017):14413-14421. |
入库方式： OAI收割
来源：高能物理研究所
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