1. Key Laboratory
for Ultrafine Materials of Ministry of Education, Shanghai Key Laboratory
of Advanced Polymeric Materials, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, P.R. China
2. Helmholtz Institute Ulm, Helmholtzstrasse 11, D-89081 Ulm, Germany
3. Karlsruhe Institute of Technology, P.O. Box 3640, D-76021 Karlsruhe, Germany