Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents Научная публикация
Журнал |
Iranian Polymer Journal
ISSN: 1026-1265 , E-ISSN: 1735-5265 |
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Вых. Данные | Год: 2024, DOI: 10.1007/s13726-024-01401-x | ||||||||
Ключевые слова | Ziegler–Natta catalysts; Vanadium–magnesium catalysts; Ethylene–1-hexene copolymerization; Copolymer heterogeneity; Molecular weight distribution | ||||||||
Авторы |
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Организации |
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Информация о финансировании (1)
1 | Министерство науки и высшего образования Российской Федерации (с 15 мая 2018) | FWUR-2024-0037 |
Реферат:
The kinetics of copolymerization of ethylene with 1-hexene over highly active V-Mg Ziegler–Natta catalysts [VMC: VCl4/MgCl2 + Al (i-Bu)3] at different contents of vanadium (4 and 0.1 wt% of V) was studied. Data on copolymerization ability of these catalysts, molecular weight characteristics, and compositional homogeneity of the produced copolymers were attained. It was found that the introduction of 1-hexene led to broadening of the molecular weight distribution of copolymer (an increase in the Mw/Mn value) relative to homopolyethylene due to a decrease in the molecular weight (Mn) in the region of 1–100 kg mol−1 without changes in the molecular weight in the region of Mn > 500 kg mol−1 for two used VMCs catalysts. This result testified to non-uniformity of the active centers of these catalysts in the chain transfer reaction with participation of 1-hexene. Therefore, the active centers of VMCs producing high-molecular polyethylene were virtually not involved in the chain transfer reaction with 1-hexene. At the same time, these centers were more reactive in the incorporation of 1-hexene. This led to unusual distribution of butyl branches in ethylene–1-hexene copolymers produced over VMCs, namely, to an increased content of butyl branches in the high-molecular fraction of copolymers (Mw > 1000 kg mol−1).
Библиографическая ссылка:
Zhao Z.
, Mikenas T.B.
, Guan P.
, Matsko M.A.
, Zakharov V.A.
, Wu W.
Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents
Iranian Polymer Journal. 2024. DOI: 10.1007/s13726-024-01401-x WOS Scopus OpenAlex
Copolymerization of Ethylene with 1-hexene over Highly Active Supported Ziegler–Natta Catalysts with Vanadium Active Component but Different Vanadium Contents
Iranian Polymer Journal. 2024. DOI: 10.1007/s13726-024-01401-x WOS Scopus OpenAlex
Даты:
Поступила в редакцию: | 15 мая 2024 г. |
Принята к публикации: | 1 сент. 2024 г. |
Опубликована online: | 26 нояб. 2024 г. |
Идентификаторы БД:
Web of science: | WOS:001364363500001 |
Scopus: | 2-s2.0-85210394339 |
OpenAlex: | W4404743071 |
Цитирование в БД:
Пока нет цитирований