Kinetics of Ethylene Polymerization over Titaniummagnesium Catalysts: The Reasons for the Observed Second Order of Polymerization Rate with Respect to Ethylene Научная публикация
| Журнал |
Polyolefins Journal
ISSN: 2322-2212 , E-ISSN: 2345-6868 |
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| Вых. Данные | Год: 2015, Том: 2, Номер: 1, Страницы: 27-38 Страниц : 12 DOI: 10.22063/poj.2015.1112 | ||
| Ключевые слова | polyethylene (PE); polymerization kinetics; Ziegler-Natta polymerization; molecular weight distribution / molar mass distribution | ||
| Авторы |
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| Организации |
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Информация о финансировании (1)
| 1 | Министерство образования и науки Российской Федерации |
Реферат:
The data on the effect of ethylene concentration on polymerization rate for several modifications of modern highly active titanium–magnesium catalysts TiCl4/MgCl2 are presented. These catalysts differ in titanium content and conditions of support preparation, activities, and the shape of kinetic curves. It is found that the observed order of polymerization rate with respect to ethylene in the range of ethylene pressures of 0.5–6 bar is 1.8-2.1 for all catalysts used (polymerization at 80°C, AlEt3 used as a cocatalyst). When AlEt3 was replaced with Al(i-Bu)3, the reaction order decreased to 1.3-1.4. In order to elucidate the possible reasons for the observed high order with respect to ethylene,
we analyzed the data on the effect of monomer concentration on the molecular weight of polyethylene. The results gave grounds for suggesting that the observed order with respect to monomer is attributable to the effect of ethylene concentration on the number of active sites. The possible reaction scheme explaining the nonlinear dependence of the polymerization rate on monomer concentration was proposed based on these data.
Библиографическая ссылка:
Matsko M.A.
, Zakharov V.A.
, Nikolaeva M.I.
, Mikenas T.B.
Kinetics of Ethylene Polymerization over Titaniummagnesium Catalysts: The Reasons for the Observed Second Order of Polymerization Rate with Respect to Ethylene
Polyolefins Journal. 2015. V.2. N1. P.27-38. DOI: 10.22063/poj.2015.1112 РИНЦ OpenAlex
Kinetics of Ethylene Polymerization over Titaniummagnesium Catalysts: The Reasons for the Observed Second Order of Polymerization Rate with Respect to Ethylene
Polyolefins Journal. 2015. V.2. N1. P.27-38. DOI: 10.22063/poj.2015.1112 РИНЦ OpenAlex
Даты:
| Поступила в редакцию: | 19 сент. 2014 г. |
| Принята к публикации: | 9 дек. 2014 г. |
Идентификаторы БД:
| РИНЦ: | 35096160 |
| OpenAlex: | W2180636532 |