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Statements

Subject Item
n2:RIV%2F61388955%3A_____%2F04%3A00107623%21RIV%2F2005%2FAV0%2FA54005%2FN
rdf:type
skos:Concept n17:Vysledek
dcterms:description
Kopolymerizace ethylenu se styrenem na CGC katalyzátorech: efekt substituce na cyklopentadienylovém ligandu na katalytickou aktivitu a strukturu kopolymeru. Abstrakt: Kopolymerizace ethylenu se styrenem byla zkoumána na katalyzátorech vzniklých mísením komplexů [TiCl2 eta 5-1-(SiMe2Nt-Bu-?N)-2,3,4-Me3-5-R-C5] kde R = Me (1), H (2), Bu (3), Ph (4), 4 fluorofenyl (5), a but-2-en-2-yl (6) s methylalumoxanem (MAO). Povaha substituentu R ovlivňovala katalytickou aktivitu, selektivitu, mikrostrukturu kopolymeru a jeho molekulovou váhu. Katalyzátory vzniklé z komplexů 1-3 vykazovaly o řád větší aktivitu než katalyzátory vzniklé z komplexů 4-6. Při optimálním molárním poměru Al/Ti 900, nejvíce aktivní katalyzátor produkoval kopolymer (95-97 wt %) obsahující až 47.8 mol % styrenu. Katalyzátor s nejnižší aktivitou produkoval směs kopolymeru (76-85 wt %) s polyethylenem (10 wt %) a polystyrenovými sekvencemi (3-7 wt %). The ethene-styrene copolymerization has been investigated using the dimethylsilylene-bridged (amidocyclopentadienyl)dichlorotitanium(IV) complexes [TiCl2 eta 5-1-(t-BuSiMe2N-.kappa.N)-2,3,4-Me3-5-R-C5] where R = Me (1), H (2), Bu (3), Ph (4), 4 fluorophenyl (5), and but-2-en-2-yl (6) in combination with methylalumoxane (MAO) as catalysts. The nature of the substituent R strongly influenced the catalyst activity and selectivity and the copolymer microstructure and molecular weight. The catalysts derived from 1 3 were by about one order more active than those derived from 4 6. At the optimum Al/Ti molar ratio 900, the highly active catalysts produced a pseudo random copolymer (95-97 wt %) containing up to 47.8 mol % of incorporated styrene. The low-active catalysts gave mixtures of a pseudo-random copolymer (76 - 85 wt %) with polyethene (10 wt %) and polystyrene sequences (3 - 7 wt %). The X-ray diffraction crystal structures of 2 and 4 were determined. The ethene-styrene copolymerization has been investigated using the dimethylsilylene-bridged (amidocyclopentadienyl)dichlorotitanium(IV) complexes [TiCl2 eta 5-1-(t-BuSiMe2N-.kappa.N)-2,3,4-Me3-5-R-C5] where R = Me (1), H (2), Bu (3), Ph (4), 4 fluorophenyl (5), and but-2-en-2-yl (6) in combination with methylalumoxane (MAO) as catalysts. The nature of the substituent R strongly influenced the catalyst activity and selectivity and the copolymer microstructure and molecular weight. The catalysts derived from 1 3 were by about one order more active than those derived from 4 6. At the optimum Al/Ti molar ratio 900, the highly active catalysts produced a pseudo random copolymer (95-97 wt %) containing up to 47.8 mol % of incorporated styrene. The low-active catalysts gave mixtures of a pseudo-random copolymer (76 - 85 wt %) with polyethene (10 wt %) and polystyrene sequences (3 - 7 wt %). The X-ray diffraction crystal structures of 2 and 4 were determined.
dcterms:title
Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure Kopolymerizace ethylenu se styrenem na CGC katalyzátorech: efekt substituce na cyklopentadienylovém ligandu na katalytickou aktivitu a strukturu kopolymeru
skos:prefLabel
Kopolymerizace ethylenu se styrenem na CGC katalyzátorech: efekt substituce na cyklopentadienylovém ligandu na katalytickou aktivitu a strukturu kopolymeru Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure
skos:notation
RIV/61388955:_____/04:00107623!RIV/2005/AV0/A54005/N
n3:strany
97;103
n3:aktivita
n12:Z n12:P
n3:aktivity
P(GA203/02/0436), P(IBS4040017), P(LN00B142), Z(AV0Z4040901)
n3:cisloPeriodika
1
n3:dodaniDat
n10:2005
n3:domaciTvurceVysledku
n5:7277962 n5:9689907 n5:6327230
n3:druhVysledku
n15:J
n3:duvernostUdaju
n11:S
n3:entitaPredkladatele
n16:predkladatel
n3:idSjednocenehoVysledku
558835
n3:idVysledku
RIV/61388955:_____/04:00107623
n3:jazykVysledku
n18:eng
n3:klicovaSlova
titanium; constrained geometry catalysts; crystal structures
n3:klicoveSlovo
n6:titanium n6:constrained%20geometry%20catalysts n6:crystal%20structures
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[6A131E389A94]
n3:nazevZdroje
Journal of Molecular Catalysis
n3:obor
n13:CF
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
8
n3:projekt
n8:GA203%2F02%2F0436 n8:IBS4040017 n8:LN00B142
n3:rokUplatneniVysledku
n10:2004
n3:svazekPeriodika
224
n3:tvurceVysledku
Pinkas, Jiří Salajka, Z. Císařová, I. Skeřil, R. Horáček, Michal Mach, Karel Varga, V. Šindelář, P.
n3:zamer
n14:AV0Z4040901
s:issn
1381-1169
s:numberOfPages
7