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本文介绍了在聚偏氟乙烯铸膜液中添加无机纳米Al2O3粒子,采用干-湿法纺丝制备γ-Al2O3中空纤维膜的方法。对纳米γ-Al2O3的分散性能的研究发现,在添加剂含量为4%的情况下粒子在二甲基甲酰胺(DMF)体系中的沉降性能最好。并使用电镜对膜的微观结构进行了分析,初步研究了无机粒子在膜孔形成的过程中所起的作用和机理。并且对膜的孔隙率、最大孔径、力学性能和截留率进行了表征。结果表明膜的孔性能、分离性能及力学性能都有一定的改善。孔隙率在提高的同时,其最大孔径相应变小,对牛血清白蛋白的截留率从25.11%提高到67.20%。最大应力和断裂应力分别从3.35N/mm2和3.09N/mm2提高到3.58N/mm2和3.41N/mm2。
In this paper, a method of preparing γ-Al2O3 hollow fiber membrane by dry-wet spinning was introduced in this paper. The dispersion properties of nano-γ-Al2O3 nanocomposite were investigated. It was found that the particle settling behavior was the best in dimethylformamide (DMF) system with 4% additive. The microstructure of the film was analyzed by electron microscopy, and the role and mechanism of the inorganic particles in the formation of the film pores were preliminary studied. The membrane porosity, maximum pore size, mechanical properties and rejection were characterized. The results show that the membrane pore properties, separation performance and mechanical properties have a certain improvement. As the porosity increases, the maximum pore size decreases correspondingly, and the rejection of bovine serum albumin increases from 25.11% to 67.20%. The maximum stress and the rupture stress increase from 3.35N / mm2 and 3.09N / mm2 to 3.58N / mm2 and 3.41N / mm2, respectively.