【摘要】 以聚醚酰亚胺(PEI)为膜材料，N-二甲基吡咯烷酮(NMP)为溶剂，采用干喷湿法纺丝制备PEI中空纤维膜，利用扫描电子显微镜对PEI中空纤维膜的形态进行表征，研究了芯液中NMP含量、芯液/纺丝液挤出速度比、空气层高度、凝固浴中NMP含量、卷绕速度和凝固浴温度对PEI中空纤维膜结构的影响。结果表明：凝固浴中NMP含量和卷绕速度对PEI中空纤维膜的孔结构影响最为明显，当芯液中NMP体积分数为90%、芯液/纺丝液挤出速度比为1.4～2.1、空气层高度为5 cm、凝固浴中NMP体积分数为30%、卷绕速度为5.87 m/min时，可形成外径小于500μm的完全海绵状孔结构中空纤维膜；凝固浴温度从5℃提升至50℃不会影响中空纤维膜的海绵状孔结构，但其孔隙率从65.23%提升至71.99%,气体分离性能下降。更多还原

【Abstract】 Polyetherimide(PEI) hollow fiber membranes were prepared by dry-jet wet spinning using PEI as membrane material and N-dimethylpyrrolidone(NMP) as solvent. The morphology of PEI hollow fiber membranes was characterized by scanning electron microscopy. The effects of NMP content in the core solution, extrusion speed ratio of core solution/spinning solution, air layer height, NMP content of coagulation bath, winding speed, and coagulation bath temperature on the structure of PEI hollow fiber membranes were studied. The results showed that the NMP content in the coagulation bath and winding speed have the most significant impact on the pore structure of PEI hollow fiber membrane, when the NMP volume fraction in the core solution was 90%, the extrusion speed ratio of the core solution/spinning solution was 1.4-2.1, the air layer height was 5 cm, the NMP volume fraction in the coagulation bath was 30%, and the winding speed was 5.87 m/min, a completely sponge like pore structure hollow fiber membrane with an outer diameter lower than 500 μ m can be formed; raising the temperature of the coagulation bath from 5 ℃ to 50 ℃ did not affect the sponge like pore structure of PEI hollow fiber membrane, but increasing the porosity from 65.23% to 71.99% resulted in a decrease in gas separation performance.更多还原