1. Department of Macromolecular Science, The Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, People's Republic of China; Laboratory of Polymer Technology, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands; Dutch Polymer Institute, PO Box 902, 5600 AX Eindhoven, The Netherlands; and DSM Research, PO Box 18, 6160 MD Geleen, The Netherlands