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Journal of Nanomaterials
Volume 2012, Article ID 348156, 7 pages
Research Article

Modification of Clays by Sol-Gel Reaction and Their Use in the Ethylene In Situ Polymerization for Obtaining Nanocomposites

1Grupo de Investigación en Materiales Avanzados y Energía, Centro de Investigaciones, Instituto Tecnológico Metropolitano, A.A 54959 Medellín, Colombia
2Departamento de Ingeniería Química, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile
3Center for Advanced Interdisciplinary Research in Materials (CIMAT), Santiago, Chile
4Departamento de Química y Biología, Universidad Santiago de Chile, Santiago, Chile

Received 24 April 2011; Revised 11 August 2011; Accepted 30 August 2011

Academic Editor: Amir Kajbafvala

Copyright © 2012 E. Moncada 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.


The nanocomposites formation by in situ polymerization used a metallocene catalyst (butyl-2-cyclopentadienyl zirconium 2-chlorines) and a hectorite synthetic clay type which is discussed. This research was carried out in two phases. The first phase consisted of mixing the components of the metallocenic polymerization reaction (metallocene-methylaluminoxane-ethylene) with clay in a reactor. In the second phase, the metallocenic catalytic system was supported by clay particles and then a polymerization reaction was made. In this second phase, the clay particles were modified using a sol-gel reaction with different pH values: pH = 3, pH = 8, and pH = 12. The results were compared in terms of the catalytic activity in the different systems (phase 1 and phase 2) and the nanoparticle morphology of nanocomposites generated in this study.