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Volumn 46, Issue 12, 2008, Pages 4162-4174

Factors affecting product distributions in ethylene/styrene copolymerization by (aryloxo)(cyclopentadienyl)titanium complexes-MAO catalyst systems

Author keywords

Copolymerization; Ethylene; Styrene half titanocene; Titanium

Indexed keywords

TITANIUM; TITANIUM COMPOUNDS;

EID: 45449088155     PISSN: 0887624X     EISSN: 10990518     Source Type: Journal    
DOI: 10.1002/pola.22765     Document Type: Article
Times cited : (24)

References (60)
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    • K.N. would like to express his personal thanks to Mr. Norio Tomotsu (Idemitsu Kosan Co. Ltd, for his helpful comments (pointing out the facts) concerning this project
    • K.N. would like to express his personal thanks to Mr. Norio Tomotsu (Idemitsu Kosan Co. Ltd.) for his helpful comments (pointing out the facts) concerning this project.
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    • Ethylene concentrations under the reaction conditions were estimated by the equation quoted by Kissin (Kissin, Y. V. Isospecific Polymerization of Olefin with Heterogeneous Ziegler-Natta Catalysts; Springer-Verlag: NewYork, 1985; pp 3.), and the ethylene solubilities in the reaction mixture (1 atm) were used as those in toluene reported in the following article, Sahgal, A.; La, H. M.; Hayduk, W. Can J Chem Eng 1978, 56, 354-357.
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    • A reviewer commented that the activity in ethylene polymerization by 2-MAO catalyst systems decreased at higher temperature (55 and 70 °C, runs 16,17, and the molecular weight distributions (Mw/Mn) in the resultant became broad. The resultant copolymers as well as syndiotactic polystyrenes possessed uniform molecular weight distributions even these (co)polymerizations were performed at 55, 70 °C, and these were seen only under the conditions for ethylene homopolymerization. One reason for decrease in the activity would be due to the decrease in ethylene concentration in the mixture,20 but formation of several catalytically active species in the mixture (probably due to the catalyst decomposition) should be considered under these conditions due to the broad distributions, although, as assumed previously by 1, possibility of polyethylene precipitation during the polymerization runs can also be considered.19
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    • 2 in the presence of MAO (characterized by ESR) were not active in the polymerization of ethylene, propylene, but were cleanly oxidized upon exposure of propylene to Ti(IV) species. Formation of Ti(III) in the presence of MAO and the oxidation into Ti(IV)by propylene [mechanistic studies in propylene polymerization by titanium complexes containing benzamidinate ligands], for example, Volkis, V.; Lisovskii, A.; Tumanskii, B.; Shuster, M.; Eisen, M. S. Organometallics 2006, 25, 2656-2666.
    • 2 in the presence of MAO (characterized by ESR) were not active in the polymerization of ethylene, propylene, but were cleanly oxidized upon exposure of propylene to Ti(IV) species. Formation of Ti(III) in the presence of MAO and the oxidation into Ti(IV)by propylene [mechanistic studies in propylene polymerization by titanium complexes containing benzamidinate ligands], for example, Volkis, V.; Lisovskii, A.; Tumanskii, B.; Shuster, M.; Eisen, M. S. Organometallics 2006, 25, 2656-2666.
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    • 1H NMR spectra due to the standard samples in calibration curve for analysis of styrene contents chosen for these analyses.
    • 1H NMR spectra due to the standard samples in calibration curve for analysis of styrene contents chosen for these analyses.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.