The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers Full article
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Polymer Science Series B
ISSN: 1560-0904 , E-ISSN: 1531-8583 |
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| Output data | Year: 2020, Volume: 62, Number: 1, Pages: 14-21 Pages count : 8 DOI: 10.1134/S1560090420010091 | ||||
| Tags | ZIEGLER-NATTA CATALYSTS; PROPAGATION RATE CONSTANTS; PROPYLENE POLYMERIZATION; HOMOPOLYMERIZATION; COPOLYMERIZATION; PROPENE; PECULIARITIES; POLYETHYLENE; TEMPERATURE; PARAMETERS | ||||
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | ГЗ-2017-2020 |
Abstract:
Using the inhibition of polymerization by radioactive carbon monoxide 14СО, the effect of hydrogen (chain transfer agent) on the number of active centers and propagation rate constant in ethylene polymerization over modern highly active titanium–magnesium catalysts with different composition is studied. It is found that a decrease in the rate of ethylene polymerization in the presence of hydrogen is associated primarily with reduction in the number of active centers and these changes are reversible at the introduction/removal of hydrogen. The scheme of reversible temporary deactivation of active center precursors is advanced to explain the experimental results. According to the data on the effect of hydrogen concentration on the molecular weight of polyethylene and the values of propagation rate constants, the rate constant of polymer chain transfer by hydrogen is calculated for catalysts with different composition. © 2020, Pleiades Publishing, Ltd.
Cite:
Sukulova V.V.
, Barabanov A.A.
, Mikenas T.B.
, Matsko M.A.
, Zakharov V.A.
The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers
Polymer Science Series B. 2020. V.62. N1. P.14-21. DOI: 10.1134/S1560090420010091 WOS Scopus РИНЦ AN OpenAlex
The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers
Polymer Science Series B. 2020. V.62. N1. P.14-21. DOI: 10.1134/S1560090420010091 WOS Scopus РИНЦ AN OpenAlex
Original:
Сукулова В.В.
, Барабанов А.А.
, Микенас Т.Б.
, Мацько М.А.
, Захаров В.А.
Исследование кинетики полимеризации этилена в присутствии водорода на титан-магниевых катализаторах на основе данных о числе и реакционной способности активных центров
Высокомолекулярные соединения. Серия Б. 2020. Т.62. №1. С.17-25. DOI: 10.31857/S230811392001009X РИНЦ OpenAlex
Исследование кинетики полимеризации этилена в присутствии водорода на титан-магниевых катализаторах на основе данных о числе и реакционной способности активных центров
Высокомолекулярные соединения. Серия Б. 2020. Т.62. №1. С.17-25. DOI: 10.31857/S230811392001009X РИНЦ OpenAlex
Dates:
| Submitted: | May 14, 2019 |
| Accepted: | Aug 20, 2019 |
| Published print: | Jan 1, 2020 |
| Published online: | Mar 16, 2020 |
Identifiers:
| Web of science: | WOS:000519896200002 |
| Scopus: | 2-s2.0-85081962247 |
| Elibrary: | 43254611 |
| Chemical Abstracts: | 2020:525058 |
| OpenAlex: | W3012158253 |