1. Department of Materials Science and Engineering
2. College of Engineering
3. Key Laboratory of Polymer Chemistry and Physics of Ministry of Education
4. Peking University
5. Beijing 100871
6. State Key Laboratory for Mechanical Behavior of Materials
7. Xi’an Jiaotong University
8. Xi’an 710049
9. China
10. Department of Chemistry
11. University of North Carolina at Chapel Hill
12. Chapel Hill
13. USA
14. Institute of Chemistry
15. Chinese Academy of Sciences
16. Beijing