1. Grupo de Polímeros USB, Departamento de Ciencia de los Materiales, Universidad Simón Bolívar, Apartado 89000, Caracas 1080-A, Venezuela
2. Department of Chemistry, University of Reading, Reading RG6 6AD, United Kingdom
3. Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials & Polymers (CIRMAP), University of Mons-Hainaut, Place du Parc 20, Mons B-7000, Belgium