1. State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu610065, Sichuan, China
2. Institute of New Energy and Low-Carbon Technology of Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu610065, Sichuan, China
3. Open Laboratory on Experimental Micro and Nano Mechanics, Institute of Mechanics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Block 4, 1113Sofia, Bulgaria