The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers

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The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers. / Sukulova, V. V.; Barabanov, A. A.; Mikenas, T. B. et al.

In: Polymer Science - Series B, Vol. 62, No. 1, 01.2020, p. 14-21.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{952e5850806342dba66d2388621212cc,

title = "The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers",

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.",

keywords = "ZIEGLER-NATTA CATALYSTS, PROPAGATION RATE CONSTANTS, PROPYLENE POLYMERIZATION, HOMOPOLYMERIZATION, COPOLYMERIZATION, PROPENE, PECULIARITIES, POLYETHYLENE, TEMPERATURE, PARAMETERS",

author = "Sukulova, {V. V.} and Barabanov, {A. A.} and Mikenas, {T. B.} and Matsko, {M. A.} and Zakharov, {V. A.}",

note = "Publisher Copyright: {\textcopyright} 2020, Pleiades Publishing, Ltd.",

year = "2020",

month = jan,

doi = "10.1134/S1560090420010091",

language = "English",

volume = "62",

pages = "14--21",

journal = "Polymer Science - Series B",

issn = "1560-0904",

publisher = "Pleiades Publishing",

number = "1",

}

RIS

TY - JOUR

T1 - The Kinetic Study of Ethylene Polymerization over Titanium–Magnesium Catalysts in the Presence of Hydrogen: The Number and Reactivity of Active Centers

AU - Sukulova, V. V.

AU - Barabanov, A. A.

AU - Mikenas, T. B.

AU - Matsko, M. A.

AU - Zakharov, V. A.

PY - 2020/1

Y1 - 2020/1

N2 - 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.

AB - 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.

KW - ZIEGLER-NATTA CATALYSTS

KW - PROPAGATION RATE CONSTANTS

KW - PROPYLENE POLYMERIZATION

KW - HOMOPOLYMERIZATION

KW - COPOLYMERIZATION

KW - PROPENE

KW - PECULIARITIES

KW - POLYETHYLENE

KW - TEMPERATURE

KW - PARAMETERS

UR - http://www.scopus.com/inward/record.url?scp=85081962247&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=43254611

U2 - 10.1134/S1560090420010091

DO - 10.1134/S1560090420010091

M3 - Article

AN - SCOPUS:85081962247

VL - 62

SP - 14

EP - 21

JO - Polymer Science - Series B

JF - Polymer Science - Series B

SN - 1560-0904

IS - 1

ER -

ID: 23895854