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Statements

Subject Item
n2:RIV%2F00216224%3A14330%2F03%3A00011170%21RIV%2F2005%2FAV0%2F143305%2FN
rdf:type
skos:Concept n11:Vysledek
dcterms:description
A new class of highly active catalysts for polyalkene production emerged with the synthesis of (tert-butylamido)dimethyl(2,3,4,5-tetramethylcyclopentadienyl)silane as the h5:h1(N)-dianionic ligand and, subsequently, ansa-{h5:h1(N)-((tert-butylamido)dimethyl(2,3,4,5-tetramethylcyclopentadienyl)silane}dichlorotitanium(IV). These catalysts, called %22constrained geometry catalysts%22 (CGC), arise from mixing of the amidocyclopentadienyl-titanium with excess methylalumoxane (MAO). Compared to titanocene or zirconocene-based single-site catalysts the latter provide more acidic and less sterically encumbered cationic centres and, consequently, display very high activities in the polymerisation of ethene, propene and in copolymerizations of ethene with terminal alkenes, cycloalkenes and styrene. In attempts to tune the polymerisation properties the parent CGC complex was modified by replacing the cyclopentadienyl ligand by indenyl or fluorenyl ligands, and their rings as well as the amide groups were variously A new class of highly active catalysts for polyalkene production emerged with the synthesis of (tert-butylamido)dimethyl(2,3,4,5-tetramethylcyclopentadienyl)silane as the h5:h1(N)-dianionic ligand and, subsequently, ansa-{h5:h1(N)-((tert-butylamido)dimethyl(2,3,4,5-tetramethylcyclopentadienyl)silane}dichlorotitanium(IV). These catalysts, called %22constrained geometry catalysts%22 (CGC), arise from mixing of the amidocyclopentadienyl-titanium with excess methylalumoxane (MAO). Compared to titanocene or zirconocene-based single-site catalysts the latter provide more acidic and less sterically encumbered cationic centres and, consequently, display very high activities in the polymerisation of ethene, propene and in copolymerizations of ethene with terminal alkenes, cycloalkenes and styrene. In attempts to tune the polymerisation properties the parent CGC complex was modified by replacing the cyclopentadienyl ligand by indenyl or fluorenyl ligands, and their rings as well as the amide groups were variously n/a
dcterms:title
Copolymerisation of ethylene with styrene using CGC Catalyst: The effect of cyclopentadienyl ligand substitution on the Catalyst Activity and Copolymer Structure n/a Copolymerisation of ethylene with styrene using CGC Catalyst: The effect of cyclopentadienyl ligand substitution on the Catalyst Activity and Copolymer Structure
skos:prefLabel
n/a Copolymerisation of ethylene with styrene using CGC Catalyst: The effect of cyclopentadienyl ligand substitution on the Catalyst Activity and Copolymer Structure Copolymerisation of ethylene with styrene using CGC Catalyst: The effect of cyclopentadienyl ligand substitution on the Catalyst Activity and Copolymer Structure
skos:notation
RIV/00216224:14330/03:00011170!RIV/2005/AV0/143305/N
n3:strany
12-13
n3:aktivita
n12:P
n3:aktivity
P(IBS4040017)
n3:dodaniDat
n16:2005
n3:domaciTvurceVysledku
n8:6275648
n3:druhVysledku
n9:D
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n13:predkladatel
n3:idSjednocenehoVysledku
602261
n3:idVysledku
RIV/00216224:14330/03:00011170
n3:jazykVysledku
n6:eng
n3:klicovaSlova
CGC, ethylene, styrene, copolymer
n3:klicoveSlovo
n10:CGC n10:copolymer n10:ethylene n10:styrene
n3:kontrolniKodProRIV
[A3698B23A09D]
n3:mistoKonaniAkce
J. Heyrovsky Institute, Prague
n3:mistoVydani
Prague
n3:nazevZdroje
XXXV Symposium On Catalysis
n3:obor
n19:CD
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
2
n3:projekt
n15:IBS4040017
n3:rokUplatneniVysledku
n16:2003
n3:tvurceVysledku
Salajka, Zdeněk Skeřil, Robert
n3:typAkce
n18:EUR
n3:zahajeniAkce
2003-01-01+01:00
s:numberOfPages
95
n4:hasPublisher
Ústav fyzikální chemie J. Heyrovského AV ČR
n14:organizacniJednotka
14330