1. State Key Laboratory
of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China
2. Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, U.K.
3. School of
Mechanical and Aerospace Engineering, Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AH, U.K.