1. Laboratory of Polymer Technology, Åbo Akademi University, Biskopsgatan 8, FIN-20500 Åbo, Finland; Borealis Polymers Oy, P.O. Box 330, FIN-06101 Porvoo, Finland; Laboratory of Physical Chemistry and Electrochemistry, Helsinki University of Technology, PB 6100, FIN-02015 HUT, Finland; and Laboratory of Polymer Chemistry, University of Helsinki, PB 55, FIN-00014 HY, Finland