1. College of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, P. R. China
2. School of materials science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, P. R. China
3. State Key Laboratory of Fluorinated Functional Membrane Materials, Dongyue Group, Zibo, Shandong 256401, P. R. China