Kinetic Features of Ethylene Сopolymerization with 1-Hexene over Titanium-Magnesium Ziegler-Natta Catalysts: Effect of Comonomer on the Number of Active Centers and the Propagation Rate Constant Full article
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Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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| Output data | Year: 2019, Volume: 369, Pages: 276-282 Pages count : 7 DOI: 10.1016/j.jcat.2018.11.008 | ||||
| Tags | Ethylene/1-hexene copolymerization; Number of active centers; Polymerization kinetics; Propagation rate constant; 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 | ГЗ-2017-2020 |
Abstract:
We present data on the no. of active centers (CP) and the propagation rate const. (kP) upon copolymn. of ethylene and 1-hexene over supported titanium-magnesium catalysts of different compns. obtained by polymn. quenching with radioactive carbon monoxide (14CO). The rise in ethylene/1-hexene copolymn. rate as compared to the rate of homopolymn. (the comonomer effect) is found to be related to the increase in the calcd. propagation rate const. Meanwhile, the increased 1-hexene concn. results in a higher calcd. kP value. Addn. of 1-hexene during ethylene polymn. also increases the polymn. rate by raising the calcd. kP value. These findings demonstrate that the comonomer effect is caused by the increase in monomer concn. in the copolymer layer that is formed on a catalyst particle and is characterized by reduced crystallinity as compared to that of homopolymer. The decline in the copolymn. rate with time is caused by redn. of the no. of active centers.
Cite:
Sukulova V.V.
, Barabanov A.A.
, Matsko M.A.
, Zakharov V.A.
, Mikenas T.B.
Kinetic Features of Ethylene Сopolymerization with 1-Hexene over Titanium-Magnesium Ziegler-Natta Catalysts: Effect of Comonomer on the Number of Active Centers and the Propagation Rate Constant
Journal of Catalysis. 2019. V.369. P.276-282. DOI: 10.1016/j.jcat.2018.11.008 WOS Scopus РИНЦ РИНЦ РИНЦ OpenAlex AN
Kinetic Features of Ethylene Сopolymerization with 1-Hexene over Titanium-Magnesium Ziegler-Natta Catalysts: Effect of Comonomer on the Number of Active Centers and the Propagation Rate Constant
Journal of Catalysis. 2019. V.369. P.276-282. DOI: 10.1016/j.jcat.2018.11.008 WOS Scopus РИНЦ РИНЦ РИНЦ OpenAlex AN
Dates:
| Submitted: | May 10, 2018 |
| Accepted: | Nov 5, 2018 |
| Published online: | Nov 27, 2018 |
| Published print: | Jan 1, 2019 |
Identifiers:
| ≡ Web of science: | WOS:000460711700029 |
| ≡ Scopus: | 2-s2.0-85057167420 |
| ≡ Elibrary: | 38626838 | 41786316 | 41610949 |
| ≡ OpenAlex: | W2902540221 |
| ≡ Chemical Abstracts: | 2018:2242731 |