1. Key Laboratory of Leather Chemistry and Engineering; Sichuan University; Ministry of Education; Chengdu 610065 China
2. National Engineering Laboratory for Clean Technology of Leather Manufacture; Sichuan University; Chengdu 610065 China
3. Chengdu Institute of Organic Chemistry; Chinese Academy of Science; Center of Polymer Science and Technology; Chengdu 610041 China
4. University of Chinese Academy of Sciences; Beijing 100049 China