1. Department of Polymer Chemistry, Zernike Institute for Advanced Materials; University of Groningen; Nijenborgh 4 9747 AG Groningen The Netherlands
2. Department of Chemical Engineering and Chemistry, Laboratory of Materials and Interface Chemistry and CryoTEM Research Unit; Eindhoven University of Technology; P.O. Box 513 5600 MB Eindhoven The Netherlands
3. Netherlands Organization for Scientific Research; DUBBLE beamline at the ESRF; 6 rue Jules Horowitz, BP 220 38043, CEDEX 9 Grenoble France
4. Dutch Polymer Institute; P.O. Box 902 5600 AX Eindhoven The Netherlands