Poisoning effect of CO on ethylene polymerization with Ni(II)–diimine/MAO
作者： Dae Sik Hong , Dong Wook Jeong , Hyun Yong Cho , Liqiang Cui , Naresh Hiraral Tarte
DOI: 10.1016/J.POLYMER.2005.11.019
关键词: Carbon monoxide 、 Reactivity (chemistry) 、 Stoichiometry 、 Active site 、 Chain propagation 、 Active center 、 Nickel 、 Stereochemistry 、 Crystallography 、 Reaction rate constant 、 Chemistry
摘要: Abstract CO was not a comonomer but an inhibitor in ethylene polymerization catalyzed over [1,2-bis(2,6-diisopropylphenylimino)]acenaphthene nickel(II) dibromide ( 1 )/MAO. The average number of active sites, [ C ¯ * ] , and the rate constant for chain propagation, k p )/MAO system determined using inhibition method based on assumption that two molecules coordinate to each center. At 0 °C, centers, increased with Al/Ni ratio, influenced by ratio. Up ratio 3000, sites saturated. Single site present at high its reactivity is uniform 0 °C. maximum activity 5262.07 (kg-PE/mol–Ni/atm/hr) 65.7% ) converted form cation complexes 0 °C molar 5000, while 36.5% activated 250. Above 30 °C, complicated poisoning behavior observed because stoichiometry centers were their thermal stability very poor.
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