Ethylene Polymerisation by Ni-Diphosphine Azine Complexes
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F07%3A00096228" target="_blank" >RIV/67985858:_____/07:00096228 - isvavai.cz</a>
Result on the web
—
DOI - Digital Object Identifier
—
Alternative languages
Result language
angličtina
Original language name
Ethylene Polymerisation by Ni-Diphosphine Azine Complexes
Original language description
The characteristics of the cationic Ni-diphosphine azine complexes of general formula [NiX(PR2CH2C(But)=NN=C(But)CH2PR2)]+ {X=Br, R=cyclohexyl (cy), iso-propyl (Pri), tert-butyl (But), phenyl (Ph); X=Cl or I, R=cyclohexyl) as catalysts for the polymerization of ethylene were evaluated in the presence or absence of co-catalysts such as MAO, DEAC, TMA, or TIBA. The best results were obtained with MAO. The ability of the complexes to generate active catalysts is strongly influenced by the characteristics of the halogen co-ligand and by the nature of the R group at the phosphine azine ligand. The best catalyst is [NiBr{PCy2CH2C(But)=NN=C(But)CH2PCy2}]Br activated by MAO. The polymers obtained showed by by 1H and 13C NMR and DSC to be formed by branched polyethylenes, the number of branches increased with the temperature at which the polymerization took place. The molecular weight of the polymeric material was tentatively estimated from the NMR spectra.
Czech name
Polymerace ethylenu N-difosfinoazinovými komplexy
Czech description
Byly zhodnoceny vlastnosti komplexů [NiX(PR2CH2C(But)=NN=C(But)CH2PR2)]+ (kde X = Br a R = cyklohexyl (Cy), isopropyl (Pri), tert-butyl (But), fenyl (Ph); X = Cl nebo I a R = cyklohexyl) jako katalyzátorů pro polymerizaci ethylenu bez nebo s kokatalyzátory methylaluminoxan (MAO), diethylaluminiumchlorid, trimethylaluminium nebo tri(isobutyl)aluminium. Nejlepší výsledky byly získány s [NiBr(PCy2CH2C(But)=NN=C(But)CH2PCy2)]Br aktivovaným MAO (A = 25.8 kg (mol Ni)-1 bar-1 h-1). Polymery byly charakterizovány NMR a diferenciální skenovací kalorimetrií jako větvené polyethyleny, počet větvení se zvyšoval s teplotou polymerace. Molekulové hmotnosti polymerů byly odhadnuty s pomocí NMR. Návrh aktivního prekurzoru katalyzátoru byl u činěn na základě experimentálních dat a MO výpočtů.
Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CA - Inorganic chemistry
OECD FORD branch
—
Result continuities
Project
—
Continuities
Z - Vyzkumny zamer (s odkazem do CEZ)<br>O - Projekt operacniho programu
Others
Publication year
2007
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Polymer International
ISSN
0959-8103
e-ISSN
—
Volume of the periodical
56
Issue of the periodical within the volume
5
Country of publishing house
GB - UNITED KINGDOM
Number of pages
8
Pages from-to
613-620
UT code for WoS article
—
EID of the result in the Scopus database
—