1. Department of Technological Studies of Hydroextrusion Processes; A. A. Galkin Donetsk Institute for Physics and Engineering, National Academy of Sciences of Ukraine; R. Luxemburg 72 Donetsk 83114 Ukraine
2. Polymer Physics Department; Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences; Sienkiewicza 112, Lodz 90-363 Poland