1. Key Laboratory of Eco‐functional Polymer Materials, Ministry of Education, Key Laboratory of Eco‐Environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou Gansu 730070 China
2. Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences, Ningbo Zhejiang 315201 China
3. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou Gansu 730000 China