1. Department of Chemistry, Laboratory of Polymer Chemistry and Technology, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece
2. Department of Physics, National Technical University of Athens, Zografou Campus, GR-15780, Athens, Greece
3. Fraunhofer Institute for Wood Research – Wilhelm-Klauditz-Institut WKI, Bienroder Weg 54E, 38108 Braunschweig, Germany
4. Laboratory of X-ray, Optical Characterization and Thermal Analysis, Physics Department, Aristotle University of Thessaloniki, GR-541 24, Thessaloniki, Greece