Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture

Buch | Hardcover

VII, 207 Seiten

1997
Springer Berlin (Verlag)
978-3-540-62699-2 (ISBN)

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Thepolymerizationofole nsanddi-ole nsisoneofthemostimportanttargets inpolymerscience.Thisreviewarticledescribesrecentprogressinthis eldand deals with organo-transition metal complexes as polymerization catalysts. - cent developments in organometallic chemistry have prompted us to nd a precise description of the mechanism of propagation, chain transfer, and terminationstepsinthehomogeneouslymetal-assistedpolymerizationofole ns anddiole ns.Thus,thisdevelopmentprovidesanideafordesigninganycatalyst systems that are of interest in industry. Recently,the agostic interactionofalkylgroup(s)ontransitionmetalshas emerged as highly basic and new concept and is found to be important in understandingthemechanismofthemetal-catalyzedhomogeneousoligomer- ation and polymerization of a-ole ns. Early transition metal alkyl complexes generallyhavepartiallyionicM C bondsandshowa-agostichydrogeninter- tion that somewhat stabilizes the catalytically active species by providing el- tronsatavacantsite onthe metal.Thisisinsharp contrasttothefactthatlate transition metal alkyl complexes show mainly b-agostic hydrogen interaction that causes the hydrogen transfer easily through b-hydrogen elimination and reductive elimination, and that gives rise to the oligomerization of ole ns. Organometalliccomplexesoftheearlyandlatetransitionmetalshavebeenused as catalysts for ole n oligomerization and polymerization. The mechanism involved in these catalyst systems depends very much upon the kind of metal centersaswellastheirco-ligands,andthusthedi?erentmechanismswhichcan bedistinguishedbydetailedinvestigationsshouldbeassumedforearlyandlate transition metal catalysts. In this contribution, we review the mechanism of polymerization and oligomerization involving early transition metals, taking as our basis recent resultsinadvancedorganometallicchemistry.Firstofall,somerecentexamples of the previous reviews concerning the Ziegler-Natta polymerization are cited [1 10]. Then, relevant new reports are surveyed in a systematic fashion.

Recent Trends in the Polymerization of ?-Olefins Catalyzed by Organometallic Complexes of Early Transition Metals.- Rare Earth Metal-Initiated Living Polymerizations of Polar and Nonpolar Monomers.- Polymerizations in Liquid and Supercritical Carbon Dioxide.- Design and Construction of Supramolecular Architectures Consisting of Cyclodextrins and Polymers.

Erscheint lt. Verlag	6.8.1997
Reihe/Serie	Advances in Polymer Science
Co-Autor	D.A. Canelas, J.M. DeSimone, A. Harada, E. Ihara, K. Mashima, A. Nakamura, Y. Nakayama, H. Yasuda
Zusatzinfo	VII, 207 p. 15 illus., 1 illus. in color.
Verlagsort	Berlin
Sprache	englisch
Maße	155 x 235 mm
Gewicht	450 g
Themenwelt	Naturwissenschaften ► Chemie ► Organische Chemie
	Naturwissenschaften ► Physik / Astronomie ► Festkörperphysik
	Naturwissenschaften ► Physik / Astronomie ► Thermodynamik
	Technik ► Maschinenbau
Schlagworte	Analytical Chemistry • Analytische Chemie • Macromolecules • Makromoleküle • Polymer • Polymere • Polymers
ISBN-10	3-540-62699-9 / 3540626999
ISBN-13	978-3-540-62699-2 / 9783540626992
Zustand	Neuware