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Influence of Hydrogen on the Polymerization of Ethylene with Nickel‐α‐diimine Catalyst
Author(s) -
Rochefort Neto Odoaldo I.,
Mauler Raquel S.,
de Souza Roberto F.
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20011101)202:17<3432::aid-macp3432>3.0.co;2-a
Subject(s) - ethylene , branching (polymer chemistry) , polyethylene , polymer chemistry , dispersity , polymerization , diimine , hydrogen , catalysis , polymer , nickel , chemistry , molar mass distribution , organic chemistry
The performance of 1,4‐bis(2,6‐diisopropylphenyl)acenaphtenediimine‐dichloronickel(II) ( 1 ) in the polymerization of ethylene was controlled by the addition of molecular hydrogen in the gas feed. Productivities obtained at 10°C with the system 1 /triisobutylaluminium decreased with the addition of hydrogen, from 499 to 6.7 kg polymer·mol –1 ·h –1 , the molecular weight average of the polyethylene dropped from 365 to 18.6 kg·mol –1 , the polydispersity index dropped from 3.0 to 1.8 but the branching degree increased from 48 to 75 branches/1 000 backbone carbon atoms. With trimethylaluminium as cocatalyst more complex behaviors were observed.