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Published
: 2022-08-23
Chloroaluminate ionic liquids as a medium of titanocene catalyst activated by alkyl aluminum compounds for ethylene polymerization
Abstract
1-Ethyl-3-methylimidazolium tetrachloroaluminate ([EMIM]+[AlCl4]-) and 1-n-butyl-3- -methylimidazolium tetrachloroaluminate ([BMIM]+[AlCl4]-) ionic liquids were applied in biphasic ethylene polymerization as a medium of Cp2TiCl2 titanocene catalyst. The effects of alkylaluminum compound (MAO, AlEt3, AlEt2Cl, AlEtCl2), the activator/catalyst molar ratio, polymerization time, ethylene pressure, catalyst recycling and the volume of the ionic liquid/hexane medium on the polymerization yield were investigated. Physical properties of polyethylene (PE) obtained are presented. It was shown that AlEtCl2 is the best activator investigated so far. The [BMIM]+[AlCl4]- ionic liquid is a better medium for the titanocene catalyst than [EMIM]+[AlCl4]- one. The product obtained is characterized primarily by its high crystallity degree and shows the properties of a typical linear polyethylene. Thus, biphasic ionic liquid polymerization of ethylene can be a potential alternative to that with a metallocene catalyst immobilized on a solid carrier.
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Ochędzan-Siodłak, W., & Pawelska, P. (2022). Chloroaluminate ionic liquids as a medium of titanocene catalyst activated by alkyl aluminum compounds for ethylene polymerization. Polimery, 53(5), 371–376. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/1321
