1. Delft University of Technology, Polymer Materials and Engineering, Julianalaan 136, 2628 BL Delft, The Netherlands; Teijin Twaron B.V., Research Institute, P.O. Box 9300, 6800 SB Arnhem, The Netherlands; and Dutch Polymer Institute (DPI), P.O. Box 902, NL-5600 AX, Eindhoven, The Netherlands