1. Division of Chemistry and Biological Chemistry
2. School of Physical and Mathematical Sciences
3. Nanyang Technological University
4. Singapore 637371
5. State Key Laboratory of Molecular Engineering of Polymers
6. Institute of Materials Research and Engineering
7. A*STAR (Agency for Science, Technology and Research)
8. , Singapore 117602
9. Department of Macromolecular Science
10. Fudan University
11. Shanghai 200433, P. R. China