1. Institute of Macromolecular Compounds, Russian Academy of Sciences, 31 Bolshoy pr, 199004 Saint Petersburg, Russia
2. Chemical-Pharmaceutical University, ul. Professora Popova 14, 197022 Saint Petersburg, Russia
3. Department of Physics, American University of Beirut, P.O. Box 11-0236, Beirut 1107 2020, Lebanon and Institute of Macromolecular Compounds, Russian Academy of Sciences, 31 Bolshoy pr, 199004 Saint Petersburg, Russia
4. Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, D-55099 Mainz, Germany