1. Key Laboratory of High Performance Polymer Material and Technology of MOEDepartment of Polymer Science and EngineeringSchool of Chemistry and Chemical EngineeringNanjing University Nanjing 210093 P. R. China
2. Department of Chemical EngineeringStanford University Stanford CA 95403 USA
3. Renolit Plastic Tech (Beijing) Company Limited Beijing 101400 P. R. China
4. State Key Laboratory of Coordination ChemistryNanjing University Nanjing 210093 P. R. China