1. a 'P. Porzi'Institute of Macromolecular Chemistry, Aleea Gr. Ghica-Voda, no. 41A, lasi, RO-6600, Romania
2. b 'P. Porzi'Institute of Macromolecular Chemistry, Aleea Gr. Ghica-Voda, no. 41A, lasi, RO-6600, Romania
3. c 'P. Porzi'Institute of Macromolecular Chemistry, Aleea Gr. Ghica-Voda, no. 41A, lasi, RO-6600, Romania
4. d 'P. Porzi'Institute of Macromolecular Chemistry, Aleea Gr. Ghica-Voda, no. 41A, lasi, RO-6600, Romania
5. e Faculty of Chemical Technology, Technical University, RO 6600 Iasi, Romania