Heterogeneity of Active Sites of Ziegler-Natta Catalysts: The Effect of Catalyst Composition on the MWD of Polyethylene Научная публикация
| Журнал |
Journal of Applied Polymer Science
ISSN: 0021-8995 , E-ISSN: 1097-4628 |
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| Вых. Данные | Год: 2010, Том: 115, Номер: 4, Страницы: 2432-2439 Страниц : 8 DOI: 10.1002/app.31359 | ||
| Ключевые слова | Computer modeling, Gel permeation chromatography (GPC), Molecular weight\mass distribution, Polyethylene (PE), Ziegler-Natta catalysts | ||
| Авторы |
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| Организации |
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Реферат:
Experimental data on the molecular weight distribution (MWD) of polyethylene (PE) produced over a broad number of Ziegler-Natta catalysts differing in composition and preparation procedure are presented. These catalysts include nonsupported TiCl3 catalyst, four types of supported titanium-magnesium catalysts (TMC) differing in the content of titanium and the presence of various modifiers in the composition of the support, and a supported catalyst containing VCl4 as an active component instead of TiCl4. The studied catalysts produce PE with different molecular weights within a broad range of polydispersity (Mw/Mn = 2.8–16) under the same polymerization conditions. The heterogeneity of active sites of these catalysts was studied by deconvolution of experimental MWD curves into Flory components assuming a correlation between the number of Flory components and the number of active site types. Five Flory components were found for PE produced over nonsupported TiCl3 catalysts (Mw/Mn = 6.8), and three–four Flory components were found for PE produced over TMC of different composition. A minimal number of Flory components (three) was found for PE samples (Mw/Mn values from 2.8 to 3.3) produced over TMC with a very low titanium content (0.07 wt %) and TMC modified with dibutylphtalate. It was shown that five Flory components are sufficient to fit the experimental MWD curve for bimodal PE (Mw/Mn = 16) produced over VMC.
Библиографическая ссылка:
Nikolaeva M.I.
, Mikenas T.B.
, Matsko M.A.
, Echevskaya L.G.
, Zakharov V.A.
Heterogeneity of Active Sites of Ziegler-Natta Catalysts: The Effect of Catalyst Composition on the MWD of Polyethylene
Journal of Applied Polymer Science. 2010. V.115. N4. P.2432-2439. DOI: 10.1002/app.31359 WOS Scopus РИНЦ CAPlusCA OpenAlex
Heterogeneity of Active Sites of Ziegler-Natta Catalysts: The Effect of Catalyst Composition on the MWD of Polyethylene
Journal of Applied Polymer Science. 2010. V.115. N4. P.2432-2439. DOI: 10.1002/app.31359 WOS Scopus РИНЦ CAPlusCA OpenAlex
Даты:
| Поступила в редакцию: | 3 июн. 2009 г. |
| Принята к публикации: | 30 авг. 2009 г. |
| Опубликована online: | 14 окт. 2009 г. |
| Опубликована в печати: | 15 февр. 2010 г. |
Идентификаторы БД:
| Web of science: | WOS:000272893400064 |
| Scopus: | 2-s2.0-73849119267 |
| РИНЦ: | 15316925 |
| Chemical Abstracts: | 2009:1438322 |
| Chemical Abstracts (print): | 152:145143 |
| OpenAlex: | W2039321992 |