Number of Active Centers and Propagation Rate Constants in the Propene Polymerization on Supported Ti-Mg Catalysts in the Presence of Hydrogen Научная публикация
| Журнал |
Macromolecular Chemistry and Physics
ISSN: 1022-1352 , E-ISSN: 1521-3935 |
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| Вых. Данные | Год: 1995, Том: 196, Номер: 5, Страницы: 1751-1759 Страниц : 9 DOI: 10.1002/macp.1995.021960529 | ||
| Ключевые слова | ZIEGLER-NATTA CATALYSTS; PROPYLENE POLYMERIZATION; ETHYLENE; POLYPROPYLENE; ACTIVATION; MECHANISM; SYSTEMS | ||
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| Организации |
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Реферат:
Polymerization inhibition with radioactive carbon monoxide was used to determine the number of active centers (Cp) and the propagation rate constant (kp) in the isospecific polymerization of propene with the catalytic system TiCl4/diisobutyl phthalate/MgCl2—AlEt3—PhSi(OEt)3, The presence of hydrogen was found to decrease Cp (by a factor of = 2) and to increase kp (by a factor of = 4). In the absence of hydrogen a considerable part of the active centers (titanium-polymer bonds) reacting with 14CO seems to be inactive in the propene polymerization for steric reasons. Hydrogen is able to transform such centers into an active state. Thus, kp ~ 2,5 • 103 L/'(mol • s) at 70 °C obtained in propene polymerization in the presence of the hydrogen seems to be correct, since the portion of centers in the active state is maximum. The influence of polymerization time, external and internal donors on Cp and kp was studied.
Библиографическая ссылка:
Bukatov G.D.
, Goncharov V.S.
, Zakharov V.A.
Number of Active Centers and Propagation Rate Constants in the Propene Polymerization on Supported Ti-Mg Catalysts in the Presence of Hydrogen
Macromolecular Chemistry and Physics. 1995. V.196. N5. P.1751-1759. DOI: 10.1002/macp.1995.021960529 WOS Scopus РИНЦ CAPlusCA OpenAlex
Number of Active Centers and Propagation Rate Constants in the Propene Polymerization on Supported Ti-Mg Catalysts in the Presence of Hydrogen
Macromolecular Chemistry and Physics. 1995. V.196. N5. P.1751-1759. DOI: 10.1002/macp.1995.021960529 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 28 апр. 1994 г. |
| Принята к публикации: | 29 авг. 1994 г. |
| Опубликована в печати: | 1 мая 1995 г. |
| Опубликована online: | 12 мар. 2003 г. |
Идентификаторы БД:
| Web of science: | WOS:A1995QZ51300031 |
| Scopus: | 2-s2.0-4644225893 |
| РИНЦ: | 31003430 |
| Chemical Abstracts: | 1995:593116 |
| Chemical Abstracts (print): | 123:10039 |
| OpenAlex: | W2085589143 |