Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture (Advances in Polymer Science #133) (Paperback)

Metal Complex Catalysts Supercritical Fluid Polymerization Supramolecular Architecture (Advances in Polymer Science #133) Cover Image
By D. a. Canelas (Contribution by), J. M. Desimone (Contribution by), A. Harada (Contribution by)
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Description


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.


Product Details
ISBN: 9783662147931
ISBN-10: 3662147939
Publisher: Springer
Publication Date: October 3rd, 2013
Pages: 207
Language: English
Series: Advances in Polymer Science