1. Department of Chemistry, Università degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy
2. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56, 100 44 Stockholm, Sweden
3. CRC Materiali Polimerici “LaMPO”, Department of Chemistry, Università degli Studi di Milano, Via Golgi 19, 20133 Milan, Italy