1. College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering; Sichuan University; Chengdu 610065 China
2. Department of Materials Engineering; Taiyuan Institute of Technology; Taiyuan 030008 China
3. College of Materials Science and Engineering; Beijing University of Chemical Technology; Beijing 100029 China
4. National Engineering Research Center for Biomaterials; Sichuan University; Chengdu 610065 China