1. School of New Energy and Materials Southwest Petroleum University Chengdu 610500 China
2. The Center of Functional Materials for Working Fluids of Oil and Gas Field Southwest Petroleum University Chengdu 610500 China
3. State Key Laboratory of Polymer Materials Engineering Polymer Research Institute of Sichuan University Chengdu 610065 China
4. School of Engineering University of Ulster Jordanstown BT37 0QB UK