| Autor: |
ZHNAG Jun-hua, KUANG Jia, WANG Liang, LIANG Hong-wen, WANG Qing-gang |
| Jazyk: |
čínština |
| Rok vydání: |
2022 |
| Předmět: |
|
| Zdroj: |
Hecheng xiangjiao gongye, Vol 45, Iss 4, Pp 271-273 (2022) |
| Druh dokumentu: |
article |
| ISSN: |
1000-1255 |
| DOI: |
10.19908/j.cnki.ISSN1000-1255.2022.04.0271 |
| Popis: |
A series of well-defined iminopyridine-titanium complexes were prepared and characterized by nuclear magnetic resonance spectroscopy, X-ray diffraction analysis and elemental analysis. Isoprene polymerization was carried out by using those complexes as main catalyst and dried methylaluminoxane as cocatalyst.The results showed that the iminopyridine-titanium complexes with strong electron-donating group possessed high activity （up to 6.3×104 g/（mol·h））, high cis-1,4 -unit selectivity (up to 74%) and excellent thermo-stability（up to 90 ℃）. The increased steric hindrance of substituent groups would significantly reduce the catalytic acti-vity, molecular weight and cis-1,4-unit selectivity. These results indicated that the ligand structure had more effects on activity than stereo-selectivity. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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