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Polymerization of olefins with a novel dinuclear ansa-zirconocene catalyst having a biphenyl bridge (1998)

Ban, Hoang The ; Uozumi, Toshiya ; Soga, Kazuo

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 2269-2274

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ISSN: 0887-624X

Schlagwort(e): dinuclear ansa-zirconocene catalyst ; diastereomers ; biphenyl and phenyl ligands ; polymerization of ethene and propene ; copolymerization of ethene and 1-octene ; thermal stability of active species ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Both the rac- and meso-dinuclear ansa-zirconocene catalysts (μ-C12H8{[SiPh(Ind)2]ZrCl2}2) were prepared by a coupling reaction between 2 equiv of diindenylphenylchlorosilane (rac- and meso-isomers) and 1 equiv of p-dilithiobiphenyl in diethyl ether at -80°C, followed by a successive reaction with ZrCl4 · 2THF in THF at -78°C. Polymerizations of ethene and propene were conducted in a 1 dm3 high-pressure glass reactor equipped with a mechanical stirrer at 60, 80, 100, 120, and 150°C using methylalumoxane (MAO) as cocatalyst and toluene or decahydronaphthalene as the solvent. Copolymerization of ethene and 1-octene was also checked in brief. For ethene polymerization, the meso-catalyst was found to be more active, which displayed an extremely high activity to give linear polyethene with a high molecular weight and a narrow molar mass distribution (MMD). The apparent activity increased monotonously with rising polymerization temperature from 60°C up to 150°C, indicating that the active species are stable even at a high temperature. On the other hand, both the rac- and meso-catalysts showed very poor activities for propene polymerization. However, copolymerization of ethene and 1-octene proceeded at a high speed. © 1998 John Wiley & Sons, Inc. J. Polym. Sci. A Polym. Chem. 36: 2269-2274, 1998

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

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Digitale Medien

Propene polymerization with the MgCl2-supported dichlorobis(β-diketonato)titanium catalysts activated by ordinary alkylaluminums (1998)

Soga, Kazuo ; Kaji, Eiichi ; Uozumi, Toshiya

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 129-135

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ISSN: 0887-624X

Schlagwort(e): MgCl2-supported dichlorobis(β-diketonato)titanium catalysts ; catalyst activation by ordinary trialkylaluminums ; propene polymerization ; effect of Lewis bases on catalyst isospecificity ; Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Several kinds of dichlorobis(β-diketonato)titanium complexes, i.e., Ti(ace-tylacetonato)2Cl2, Ti(1-benzoylacetonato)2Cl2, Ti(2,2,6,6-tetramethyl-3,5-heptanedionato)2Cl2 and Ti(4,4,4-trifluoro-1-phenyl-1,3-butanedionato)2Cl2, were synthesized and the corresponding MgCl2-supported catalysts were prepared by impregnation method. The test of them for propene polymerization revealed that those MgCl2-supported catalysts could be activated not only by methylaluminoxane (MAO) but also by ordinary alkylaluminums as well. The effect of typical Lewis bases on the catalyst performance was investigated in some detail, which indicated that organic silanes are most effective for the improvement of isospecificity of those catalysts. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 129-135, 1998

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

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