1. Laboratory
of Plastics and Rubber Technology, Department of Physical Chemistry
and Materials Science, Budapest University of Technology and Economics, H-1521 Budapest, P.O. Box 91, Hungary
2. Institute
of Materials Science and Environmental Chemistry, Research Centre
for Natural Sciences, Hungarian Academy of Sciences, 1519 Budapest, P.O. Box 286, Hungary
3. Borealis Polyolefine GmbH, St.-Peter-Strasse 25, A-4021 Linz, Austria