1. State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065 China
2. Department of Chemical, Materials and Production Engineering University of Naples Federico II P.le Tecchio 80 Naples 80125 Italy
3. Institute for Polymers, Composites and Biomaterials National Research Council of Italy P.le E. Fermi 1 Portici 80055 Italy