1. Key Laboratory of Polymer Ecomaterials and ⊥Laboratory of Polymer Composites Engineering, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China
2. University of Science and Technology of China, Hefei 230026, P. R. China
3. Department of Polymer Science and Engineering, Hebei University of Technology, Tianjin 300130, P. R. China