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Titolo:
KINETIC PECULIARITIES OF PROPYLENE POLYMERIZATION IN THE PRESENCE OF HYDROGEN ON SUPPORTED TITANIUM MAGNESIUM CATALYSTS
Autore:
BUKATOV GD; GONCHAROV VS; ZAKHAROV VA; DUDCHENKO VK; SERGEEV SA;
Indirizzi:
BORESKOV CATALYSIS INST,SIBERIAN DIV NOVOSIBIRSK 630090 RUSSIA
Titolo Testata:
Kinetics and catalysis
fascicolo: 3, volume: 35, anno: 1994,
pagine: 358 - 362
SICI:
0023-1584(1994)35:3<358:KPOPPI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
ZIEGLER-NATTA CATALYSTS; EXTERNAL ALKOXYSILANE DONORS; PROPENE POLYMERIZATION; STEREOREGULATED POLYMERIZATION; ACTIVE-CENTERS; ETHYL BENZOATE; SILANE; SYSTEM; MGCL2; ACTIVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
32
Recensione:
Indirizzi per estratti:
Citazione:
G.D. Bukatov et al., "KINETIC PECULIARITIES OF PROPYLENE POLYMERIZATION IN THE PRESENCE OF HYDROGEN ON SUPPORTED TITANIUM MAGNESIUM CATALYSTS", Kinetics and catalysis, 35(3), 1994, pp. 358-362

Abstract

The comparative kinetic data on stereospecific polymerization of propylene are obtained for the following catalytic systems: TiCl4-diisobutyl phthalate-MgCl2-AlEt3-phenyltriethoxysilane-H-2 and TiCl4-ethyl benzoate-MgCl2-AI(iso-Bu)3-ethyl anisate. The number of active centers (C(r)i) and the propagation rate constant (k(r)i) for isospecific polymerization of propylene are determined by stopping the polymerization with radioactive carbon monoxide. It is found that C(r)i decreases and the calculated value of k(r)i rises when propylene polymerization is carried out in the presence of hydrogen. In the absence of hydrogen, a considerable fraction of active centers that contain the titanium-polymer bond and react With (CO)-C-14 is suggested to be in the inactive state due to steric reasons. Therefore, the k(r)i value of 2.5 x 10(3) lmol-1 s-1 found for propylene polymerization in the presence of hydrogen (when the fraction of the active centers is maximum) is recognizedas a correct value.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 15/07/20 alle ore 14:23:03