Table of Contents Author Guidelines Submit a Manuscript
International Journal of Polymer Science
Volume 2014, Article ID 519203, 8 pages
http://dx.doi.org/10.1155/2014/519203
Research Article

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

1Centro de Investigación en Química Aplicada, Boulevard Enrique Reyna Hermosillo, No. 140, Col. San José de los Cerritos, 25294 Saltillo, COAH, Mexico
2Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Boulevard V. Carranza, s/n, 25280 Saltillo, COAH, Mexico

Received 6 February 2014; Revised 28 May 2014; Accepted 28 June 2014; Published 15 July 2014

Academic Editor: Ali Akbar Entezami

Copyright © 2014 Luis Alexandro Valencia López et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

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.