Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F04%3A00107623" target="_blank" >RIV/61388955:_____/04:00107623 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/05:00008818 RIV/00216208:11310/05:8818
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Copolymerization of Ethene with Styrene Using CGC Catalysts. The Effect of the Cyclopentadienyl Ligand Substitution on the Catalyst Activity and Copolymer Structure
Original language description
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 derivedfrom 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.
Czech name
Kopolymerizace ethylenu se styrenem na CGC katalyzátorech: efekt substituce na cyklopentadienylovém ligandu na katalytickou aktivitu a strukturu kopolymeru
Czech 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 až47.8 mol % styrenu. Katalyzátor s nejnižší aktivitou produkoval směs kopolymeru (76-85 wt %) s polyethylenem (10 wt %) a polystyrenovými sekvencemi (3-7 wt %).
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2004
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Molecular Catalysis
ISSN
1381-1169
e-ISSN
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Volume of the periodical
224
Issue of the periodical within the volume
1
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
7
Pages from-to
97-103
UT code for WoS article
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EID of the result in the Scopus database
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