【摘要】 以质量分数为12%的聚间苯二甲酰间苯二胺(PMIA)溶液为纺丝液,采用溶液喷射纺丝技术制备了直径范围为146~532nm的PMIA纳米纤维膜,探讨了面密度对纤维膜孔径结构、透气性、水通量及过滤效率的影响.结果表明,随着面密度的增加,纤维膜的平均孔径、透气量和水通量逐渐降低,过滤效率明显增加,当面密度为22.8g/m2时,纤维膜对2.5μm聚苯乙烯(PS)微球的过滤效率高达99%以上.过滤机理研究结果表明,PS微球很大程度上被拦截在纤维膜表层,膜污染程度较小.更多还原

【Abstract】 Poly(m-phenylene isophthalamide)(PMIA)nanofibers membrane was prepared via solution blow spinning from the solution of 12% PMIA.The nanofiber diameter was in the range of 146-532 nm.The pore structure,gas permeability,water flux and filtration efficiency of PMIA nanofibers membrane were evaluated.The results indicated the pore size,gas permeability and water flux all decreased with the areal density of the nanofibers membrane increasing,while the filtration efficiency of the membrane against 2.5μm polystyrene(PS)particles was improved.The filtration efficiency was above 99% when the areal density of the membrane was 22.8 g/m2.The research on the filtration mechanism showed that the pollution level of PMIA nanofibers membrane was very low because 2.5 μm PS particles were captured mostly on the surface layer of PMIA nanofibers membrane.更多还原