1. Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoy pr. 31, 199004 St. Petersburg, Russia
2. Chemistry Department, Moscow State University, 119899 Moscow, Russia
3. Department of Physics, National Technical University of Athens, Zografou Campus, 15780 Athens, Greece
4. Department of Applied Thermodynamics, Polytechnic University of Valencia, 4606 Valencia, Spain