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采用共沉淀的方法制备了MnO_2-Fe_2O_3复合纳米粒子,并将复合粒子加入PU中制成PU共混膜。探讨了MnO_2所占复合粒子MnO_2-Fe_2O_3比例,以及复合粒子MnO_2-Fe_2O_3的含量,对PU共混膜的气体渗透性能的影响。结果表明:通过共沉淀法制备的MnO_2-Fe_2O_3粒子粒径小且均匀,复合粒子50%-MnO_2-Fe_2O_3制备的共混膜对气体分离性能最佳,当复合粒子50%-MnO_2-Fe_2O_3添加量为10%(wt,质量分数,下同)时,PU共混膜的渗透系数为18.93Barrer,O_2/N_2理论分离因子为7.48。
The coprecipitation method was used to prepare MnO_2-Fe_2O_3 composite nanoparticles, and the composite particles were added into PU to make PU blend membrane. The effects of the content of MnO_2-Fe_2O_3 and the content of MnO_2-Fe_2O_3 on the gas permeability of PU blends were investigated. The results showed that the particle size of MnO_2-Fe_2O_3 prepared by coprecipitation method was small and uniform, and the blend membrane prepared with 50% -MnO_2-Fe_2O_3 composite particles had the best performance for gas separation. When the content of 50% -MnO_2-Fe_2O_3 10% (wt, mass fraction, the same below), the permeability coefficient of PU blend membrane was 18.93 Barrer and the theoretical separation factor of O 2 / N 2 was 7.48.