Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture

Mitarbeit:Canelas, D.A.; DeSimone, J.M.; Harada, A.; Ihara, E.; Mashima, K.; Nakamura, A.; Nakayama, Y.; Yasuda, H.

• Broschiertes Buch

Produktbeschreibung

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.

Produktdetails

• Advances in Polymer Science 133
• Verlag: Springer / Springer Berlin Heidelberg / Springer, Berlin
• Artikelnr. des Verlages: 978-3-662-14793-1
• Softcover reprint of the original 1st ed. 1997
• Seitenzahl: 216
• Erscheinungstermin: 3. Oktober 2013
• Englisch
• Abmessung: 235mm x 155mm x 12mm
• Gewicht: 336g
• ISBN-13: 9783662147931
• ISBN-10: 3662147939
• Artikelnr.: 39506012

Inhaltsangabe

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.