Preparation and characterization of thermally stable poly(piperazine amide)/PPBES composite nanofiltration membrane

▶ Copoly(phthalazinone biphenyl ether sulfone) (PPBES) is a new material with excellent thermal stability and good flexibility. It is utilized to fabricate the substrate membrane of composite NF membrane for the first time. ▶ The MWCO of substrate membrane is studied to improve the performance of composite NF membrane. ▶ The composite membrane has excellent thermal resistance and can be used below 85 °C.