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Biphasic Ethylene Polymerization with a Diiminenickel Catalyst
Author(s) -
Pinheiro Maurício F.,
Mauler Raquel S.,
de Souza Roberto F.
Publication year - 2001
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/1521-3927(20010301)22:6<425::aid-marc425>3.0.co;2-f
Subject(s) - ethylene , polymerization , catalysis , polymer chemistry , molar mass distribution , ionic liquid , solution polymerization , chemistry , ionic bonding , materials science , chemical engineering , polymer , organic chemistry , ion , engineering
Ethylene is polymerized with 1,4‐bis(2,6‐diisopropylphenyl)acenaphthenediiminenickel (II) dichloride dissolved in the ionic liquid 1‐butyl‐3‐methylimidazolium organochloroaluminate under mild reaction conditions (pressure of 1050 mbar, reaction temperature between –10°C and +10°C). The catalyst solution can be reused in successive ethylene polymerization cycles upon addition of an alkylaluminium cocatalyst, showing enhanced activities and producing polyethylenes with bimodal molecular weight distributions suggesting the formation of non‐uniform active centers.