1. Department of Industrial Chemistry “Toso Montanari”, University of Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
2. Department of Physics and Astronomy “Augusto Righi”, University of Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
3. Plastod S.p.A., Via Walter Masetti 7, Calderara di Reno, 40012 Bologna, Italy