Influence of Organoboron Compounds on Ethylene Polymerization Using Cp 2 ZrCl 2 /MAO as Catalyst System
2014; Hindawi Publishing Corporation; Volume: 2014; Linguagem: Inglês
10.1155/2014/519203
ISSN1687-9430
AutoresLuis Alexandro Valencia López, Francisco Javier Enríquez‐Medrano, Ricardo Mendoza Carrizales, Florentino Soriano‐Corral, Adalí Castañeda Facio, Ramón Díaz de León,
Tópico(s)Synthetic Organic Chemistry Methods
ResumoOrganoboron compounds of nonionic and ionic nature, tris(pentafluorophenyl)borane, and N,N-dimethylanilinium tetra(pentafluorophenyl)borate were evaluated to act in conjunction with MAO as activators on ethylene polymerization by using the catalyst Cp 2 ZrCl 2 . A decrease on the catalytic activity was observed in both cases in relation with a reference polyethylene which was synthesized in absence of any organoboron compound. An increase on the crystallinity degree and molecular weight, as well as an improvement in thermal and dynamic-mechanical properties, was observed in polyethylenes synthetized in presence of tris(pentafluorophenyl)borane. A low density polyethylene with improved thermal stability was obtained when N,N-dimethylanilinium tetra(pentafluorophenyl)borate was employed as activator.
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