1. Department of Polymeric Materials & Engineering, Guizhou University, West Campus, Guizhou University, Huaxi District, Guiyang 550025, P.R. China
2. Separation Membrane Materials & Technologies Joint Research Centre of Vontron-Guizhou University, Vontron Technol Co Ltd, Guiyang 550018, Guizhou, PR China
3. College of Materials, Taiyuan University of Technology, Taiyuan 030000, China