About: Copolymerization of ethene with styrene using CGC catalysts: the effect cyclopentadienyl ligand substitution on the catalyst activity and the copolymer structure

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	The ethenestyrene copolymerization has been investigated using the dimethylsilylene-bridged (amidocyclopentadienyl)dichlorotitanium( IV) complexes [TiCl2{5-1-(SiMe2Nt-Bu-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 to 3 were by about one order more active than those derived from 4 to 6. At the optimum Al/Ti molar ratio of 900, the highly active catalysts produced a pseudo-random copolymer (9597 wt.%) containing up to 47.8 mol% of incorporated styrene. The low-active catalysts gave mixtures of a pseudo-random copolymer (7685 wt.%) with polyethene (10 wt.%) and polystyrene sequences (37 wt.%). The X-ray diffraction crystal structures of 2 and 4 were determined. The ethenestyrene copolymerization has been investigated using the dimethylsilylene-bridged (amidocyclopentadienyl)dichlorotitanium( IV) complexes [TiCl2{5-1-(SiMe2Nt-Bu-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 to 3 were by about one order more active than those derived from 4 to 6. At the optimum Al/Ti molar ratio of 900, the highly active catalysts produced a pseudo-random copolymer (9597 wt.%) containing up to 47.8 mol% of incorporated styrene. The low-active catalysts gave mixtures of a pseudo-random copolymer (7685 wt.%) with polyethene (10 wt.%) and polystyrene sequences (37 wt.%). The X-ray diffraction crystal structures of 2 and 4 were determined. (en)
Title	Copolymerization of ethene with styrene using CGC catalysts: the effect cyclopentadienyl ligand substitution on the catalyst activity and the copolymer structure Copolymerization of ethene with styrene using CGC catalysts: the effect cyclopentadienyl ligand substitution on the catalyst activity and the copolymer structure (en)
skos:prefLabel	Copolymerization of ethene with styrene using CGC catalysts: the effect cyclopentadienyl ligand substitution on the catalyst activity and the copolymer structure Copolymerization of ethene with styrene using CGC catalysts: the effect cyclopentadienyl ligand substitution on the catalyst activity and the copolymer structure (en)
skos:notation	RIV/00216224:14310/04:00030760!RIV10-MSM-14310___
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(LN00B142)
http://linked.open...iv/cisloPeriodika	224
http://linked.open...vai/riv/dodaniDat	2010
http://linked.open...aciTvurceVysledku	Skeřil, Robert
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Masarykova univerzita / Přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	558834
http://linked.open...ai/riv/idVysledku	RIV/00216224:14310/04:00030760
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Titanium; Constrained geometry catalysts; Copolymerization ethenestyrene; Copolymers ethenestyrene; Crystal structures (en)
http://linked.open.../riv/klicoveSlovo	Constrained geometry catalysts Copolymerization ethenestyrene Copolymers ethenestyrene Titanium Crystal structures
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[C557257EA3C9]
http://linked.open...i/riv/nazevZdroje	Journal of molecular catalysis A:Chemical
http://linked.open...in/vavai/riv/obor	CD
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	8 (xsd:int)
http://linked.open...vavai/riv/projekt	Research centre for complex crude oil processing
http://linked.open...UplatneniVysledku	2004
http://linked.open...v/svazekPeriodika	2004
http://linked.open...iv/tvurceVysledku	Císařová, Ivana Mach, Karel Pinkas, Jiří Horáček, Michal Šindelář, Pavel Skeřil, Robert Varga, Vojtěch Salajka, Zdeněk
issn	1381-1169
number of pages	7 (xsd:int)
http://localhost/t...ganizacniJednotka	14310

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