适宜的多孔支撑膜是制备高性能反渗透复合膜的基础。以聚砜（PSf）为膜材料，N,N-二甲基乙酰胺（DMAc）为溶剂，-丁内酯（GBL）为第二溶剂，异丙醇（IPA）为非溶剂添加剂，纯水为凝胶剂，采用浸没沉淀法制备了一系列平板支撑膜，考察了DMAc/GBL质量比、邻近比值对铸膜液黏度和膜结构和性能的影响。结果表明，随DMAc/GBL质量比减小，铸膜液的黏度增大，聚砜平板膜的结构形态由指状孔结构向海绵状结构转变，膜表面孔径减小，孔径分布变窄；随值的增大，铸膜液的黏度增大，指状孔的形成受到抑制，逐渐转变为海绵状膜结构，孔径分布变宽。

The porous support membrane is critical for the fabrication of the high-performance reverse osmosis composite membranes. A series of flat membranes were prepared by immersion precipitation method using polysulfone (PSf) as the membrane material, N,N-dimethylacetamide (DMAc) as the solvent, -butyrolactone (GBL) as the second solvent, isopropyl alcohol (IPA) as the non-solvent additive, and water as the coagulation agent. The effects of DMAc/GBL mass ratio and approaching ratio  on the viscosity of the casting solution, the membrane structure and performance were discussed herein. The results showed that as the DMAc/GBL mass ratio decreased, the viscosity of the casting solution increased, the polysulfone flat membrane changed from finger-like structure to sponge-like structure, the membrane surface pore size decreased, and the pore size distribution became narrow. As the value of  increased, the viscosity of the casting solution increased, the formation of finger-like pores was suppressed, and membranes gradually changed to sponge-like pore structure, and the pore size distribution became wide

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