1. College of Chemistry & Chemical Engineering, Key Laboratory of Environment-Friendly Polymeric Materials of Anhui Province, Anhui University, Hefei 230601, Anhui, P. R. China
2. Anhui Provincial Key Laboratory of High-Performance Rubber and Products, Anhui Zhongding Sealing Parts Co., Ltd., Ningguo 242399, Anhui, P. R. China
3. College of Polymer Science & Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, Sichuan, P. R. China