1. Laboratory of Polymer Chemistry, Laboratories of Polymer Technology and Materials and Interface Chemistry, Process Development Group, Technical University of Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands, and Laboratory of Chemical Engineering, Ben-Gurion University of the Negev, 84105 Beer-Sheva, Israel, and Dutch Polymer Institute, P.O. Box 902, NL-5600 AX Eindhoven