1. Department of Chemistry, Laboratory of Organometallic and Macromolecular Chemistry-Composite Materials; University Cadi-Ayyad; Faculty of Sciences and Technologies; Av. A. Khattabi, BP.549 40000 Marrakech Morocco
2. Department of Chemistry, Fibre and Polymer Technology-KTH-Teknikringen56-58; SE-100 44 Stockholm Sweden
3. Department of Chemistry, Engineering and Macromolecular Architectures; Institut Charles Gerhardt - UMR (CNRS) 5253- Ecole Nationale Supérieure de Chimie de Montpellier - 8 Rue Ecole Normale; 34296 Montpellier Cedex 5 France