1. State Key Laboratory of Solid Lubrication; Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences; Lanzhou 730000 China
2. University of Chinese Academy of Sciences; Beijing 100049 China
3. 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 315201 China
4. Department of Polymer Materials; Laboratory of Polymer Chemistry, College of Materials Science and Engineering, Shanghai University; Shanghai 200444 China