Propylene Polymerization over Titanium–Magnesium Catalysts: The Effect of Internal and External Stereoregulating Donors on the Number of Active Centers with Different Stereospecificity and Their Reactivity in Propagation Reaction Full article
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Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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| Output data | Year: 2021, Volume: 404, Pages: 187-197 Pages count : 11 DOI: 10.1016/j.jcat.2021.09.023 | ||
| Tags | Number of active centers; Propagation rate constant; Stereospecific propylene polymerization; Temperature rising elution fractionation (TREF); Titanium–magnesium (Ziegler–Natta) catalysts | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Ministry of Science and Higher Education of the Russian Federation | 0239-2021-0004 |
Abstract:
The combination of the method for measuring of the number of active centers by quenching of polymerization by radioactive carbon monoxide with fractionation of polymers obtained by TREF method (temperature rising elution fractionation) to the separate fractions with different isotacticity has been used for determination of the number of active centers with different isospecificity (CPi) responsible for the formation of Fi fractions as well as for calculation of propagation rate constants (kPi) for these centers.
Data on the effect of catalyst composition on the CPi and kPi values have been obtained for the first time for polymerization with three types of titanium-magnesium catalysts with different internal stereoregulating donors (di-n-butyl phthalate – TMC-D, 2,3-di-iso-butyl-diethyl succinate – TMC-S, 9,9-bis(methoxymethyl)-fluorene – TMC-F) and for catalytic system TMC-D with external stereoregulating donor – cyclohexylmethyl(dimethoxy)silane.
The possible structures of active centers with different isospecificity are discussed on the base of experimental data obtained on the CPi and kPi values.
Cite:
Barabanov A.A.
, Vereykina V.V.
, Matsko M.A.
, Zakharov V.A.
Propylene Polymerization over Titanium–Magnesium Catalysts: The Effect of Internal and External Stereoregulating Donors on the Number of Active Centers with Different Stereospecificity and Their Reactivity in Propagation Reaction
Journal of Catalysis. 2021. V.404. P.187-197. DOI: 10.1016/j.jcat.2021.09.023 WOS Scopus РИНЦ AN OpenAlex
Propylene Polymerization over Titanium–Magnesium Catalysts: The Effect of Internal and External Stereoregulating Donors on the Number of Active Centers with Different Stereospecificity and Their Reactivity in Propagation Reaction
Journal of Catalysis. 2021. V.404. P.187-197. DOI: 10.1016/j.jcat.2021.09.023 WOS Scopus РИНЦ AN OpenAlex
Dates:
| Submitted: | Jul 16, 2021 |
| Accepted: | Sep 16, 2021 |
| Published online: | Sep 27, 2021 |
| Published print: | Dec 1, 2021 |
Identifiers:
| Web of science: | WOS:000710707800009 |
| Scopus: | 2-s2.0-85116721982 |
| Elibrary: | 47511807 |
| Chemical Abstracts: | 2021:2217405 |
| OpenAlex: | W3203637571 |