1. Institute of Polymer and Dye Technology Lodz University of Technology Stefanowskiego 12/16 Lodz 90‐924 Poland
2. Centre of Molecular and Macromolecular Studies Polish Academy of Sciences Sienkiewicza 112 Lodz 90‐363 Poland
3. Faculty of Technical Physics Poznan University of Technology Piotrowo 3 Poznan 60‐965 Poland
4. Product, Processes, and Environmental Examination Laboratory Institute of Leather Industry Zgierska 73 Lodz 91‐462 Poland