1. Department of Chemical Sciences, University of Catania, V.le A. Doria 6, 95125 Catania, Italy
2. CNR-IPCF Istituto per i Processi Chimico-Fisici, Viale F. Stagno d’Alcontres 37, I-98158 Messina, Italy
3. Institute of Polymers, Composites and Biomaterials (CNR-IPCB), Via P. Gaifami 18, I-95126 Catania, Italy