聚砜/双酚A聚硫酸中空纤维超滤膜的制备及性能表征

Abstract

分别采用非溶剂致相分离法(NIPS)和逆向热致相分离法(RTIPS)制备了聚砜和聚砜/双酚A聚硫酸(PSf/BPA-PS)中空纤维超滤膜。利用纯水渗透通量、截留率、孔隙率、扫描电镜、拉伸测试及纯水接触角等分别表征了中空纤维膜的渗透性能、形态和力学性能。结果表明，PSf/BPA-PS体系的相分离温度升高，铸膜液粘度降低，利于纺膜；成膜温度低于相分离温度，所得膜表面致密、断面为双指状孔结构；成膜温度高于相分离温度，膜表面多孔且断面为海绵状结构，PSf/BPA-PS膜的力学性能优于NIPS法所成膜。 Polysulfone (PSf) and PSf/bisphenol sulfuric acid (BPA-PS) ultrafiltration hollow fiber membranes were successfully prepared by non-solvent induced phase separation (NIPS) and reverse thermally induced phase separation (RTIPS) method. Pure water permeation flux, rejection rate, porosity, scanning electron microscopy, tensile test and pure water contact angle were performed to survey the permeation, morphology and mechanical properties. The results show that the phase separa-tion temperature of PSf/BAP-PS system increases and the viscosity decreases. The membrane structure presents a dense surface and a finger-like pores structure along its cross-section by using the NIPS process. Meanwhile, the morphology of membranes takes on a porous surface and a spongy structure on its cross-section by using the RTIPS process. The mechanical properties of PSf/BAP-PS hollow fiber membranes are better than that of the memrbanes prepared with NIPS method.