Influence of Organoboron Compounds on Ethylene Polymerization Using Cp2ZrCl2/MAO as Catalyst System

• Published in: International journal of polymer science Vol. 2014; no. 2014; pp. 1 - 8
• Main Authors: Castañeda Facio, Adali, Soriano Corral, Florentino, Mendoza Carrizales, Ricardo, Enríquez-Medrano, Francisco Javier, Valencia López, Luis Alexandro, Díaz de León Gómez, Ramón Enrique
• Format: Journal Article
• Language: English
• Published: Cairo, Egypt Hindawi Publishing Corporation 01-01-2014; Hindawi Limited
• Subjects: Boron; Impact strength; Molecular weight; Polyethylene; Polymerization; Polymers
• ISSN: 1687-9422; 1687-9430
• DOI: 10.1155/2014/519203

Organoboron 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 Cp2ZrCl2. 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.