1. Institute of Polymer Chemistry and Technology-CNR, Via Campi Flegrei 34, 80078 Pozzuoli (Na), Italy, Department of Materials and Production Engineering, University of Naples Federico II, Piazzale Tecchio 80, 80125 Naples, Italy, and Polymer Institute, Slovak Academy of Sciences, Dúbravská Cesta 9, SK-84236 Bratislava, Slovakia