1. Polycondensation and Thermostable Polymers Department, “Petru Poni” Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda 41A, Iasi 700487, Romania
2. Faculty of Chemical Engineering, “Gh. Asachi” Technical University Iasi, Bd. Mangeron 71, Iasi 700050, Romania