1. State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 P.R. China
2. Key Laboratory of Carbon Fiber and Functional Polymers (Beijing University of Chemical Technology); Ministry of Education; Beijing 100029 P.R. China
3. Beijing Laboratory of Biomedical Materials; Beijing University of Chemical Technology; Beijing 100029 P.R. China
4. Department of Chemical and Biomolecular Engineering; University of Akron; Akron OH 44325 USA