1. College of Chemistry Key Laboratory of Green Chemistry and Technology of the Ministry of Education and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China
2. School of Chemical Engineering and State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 P. R. China
3. State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 P. R. China