1. CAS Key Laboratory of Engineering Plastics; CAS Research/Education Center for Excellence in Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 P. R. China
2. University of Chinese Academy of Sciences; Beijing 100049 P. R. China
3. The George W. Woodruff School of Mechanical Engineering; Renewable Bioproduct Institute; Georgia Institute of Technology; Atlanta GA 30332 USA