Amount of Active Centers and Propagation Rate Constant During Ethylene Polymerization on the 2,6-Bis(imino)pyridineiron(II) chloride + Triisobutylaluminum Homogeneous Catalyst Full article
| Journal |
Polymer Science Series B
ISSN: 1560-0904 , E-ISSN: 1531-8583 |
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| Output data | Year: 2005, Volume: 47, Number: 11-12, Pages: 349-353 Pages count : 5 | ||
| Tags | ZIEGLER-NATTA POLYMERIZATION; IRON; NUMBER; CO-14 | ||
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 03-03-33034 |
Abstract:
The amount of active centers c(p) and the propagation rate constant k(p) during ethylene polymerization over the homogeneous complex 2,6-(2,6-(Me)(2)C6H3N=CMe)(2)C5H3NFeCl2 with Al(i-Bu)(3) as an activator were determined by the method of quenching by radioactive carbon monoxide (CO)-C-14. At a rate close to maximum, active centers compose a substantial part of the iron complex (41 mol %). The k(p) value for these centers is 26 x 10(3)1/(mol s) at 35 degrees C. The activity drops with the polymerization time as a result of a decrease in both the amount of active centers (to 0.16 mol/mol Fe) and the k(p) value (to 8.2 x 10(3)1/(mol s)). Data on the influence of polymerization time on the molecular mass and the molecular-mass distribution of the product polyethylene are presented. On the basis of these data, it was assumed that highly reactive but unstable active centers generated in the initial polymerization stage affect the formation of low-molecular-mass polyethylene, while more stable and less active centers mediate the formation of polyethylene with a higher molecular mass.
Cite:
Barabanov A.A.
, Bukatov G.D.
, Zakharov V.A.
, Semikolenova N.V.
, Echevskaya L.G.
, Matsko M.A.
Amount of Active Centers and Propagation Rate Constant During Ethylene Polymerization on the 2,6-Bis(imino)pyridineiron(II) chloride + Triisobutylaluminum Homogeneous Catalyst
Polymer Science Series B. 2005. V.47. N11-12. P.349-353. WOS Scopus РИНЦ
Amount of Active Centers and Propagation Rate Constant During Ethylene Polymerization on the 2,6-Bis(imino)pyridineiron(II) chloride + Triisobutylaluminum Homogeneous Catalyst
Polymer Science Series B. 2005. V.47. N11-12. P.349-353. WOS Scopus РИНЦ
Original:
Барабанов А.А.
, Букатов Г.Д.
, Захаров В.А.
, Семиколенова Н.В.
, Ечевская Л.Г.
, Мацько М.А.
Число активных центров и константа скорости роста при полимеризации этилена на гомогенном катализаторе 2,6-бис(имино)пиридилГеС12 + А1(i-Вu)3
Высокомолекулярные соединения. Серия Б. 2005. Т.47. №12. С.2203-2208. RSCI Scopus РИНЦ ANCAN
Число активных центров и константа скорости роста при полимеризации этилена на гомогенном катализаторе 2,6-бис(имино)пиридилГеС12 + А1(i-Вu)3
Высокомолекулярные соединения. Серия Б. 2005. Т.47. №12. С.2203-2208. RSCI Scopus РИНЦ ANCAN
Dates:
| Published print: | Nov 1, 2005 |
Identifiers:
| Web of science: | WOS:000234287500012 |
| Scopus: | 2-s2.0-32644453806 |
| Elibrary: | 13496854 |