引用本文:
杜宏伟, 孔瑛. 气体分离用PI/TiO2纳米复合膜的制备[J]. 应用化学,
2003, 20(5): 462-465.
Citation: DU Hong-Wei, KONG Ying. Preparation of Polyimide/Titania Nano-composite Membrane for Gas Separation[J]. Chinese Journal of Applied Chemistry, 2003, 20(5): 462-465.
Citation: DU Hong-Wei, KONG Ying. Preparation of Polyimide/Titania Nano-composite Membrane for Gas Separation[J]. Chinese Journal of Applied Chemistry, 2003, 20(5): 462-465.
气体分离用PI/TiO2纳米复合膜的制备
摘要:
通过溶胶凝胶法制备了气体分离用PI/TiO2纳米复合膜材料。采用FT-IR、SEM、TEM、UV-Vis、耐化学介质性能和气体透气性能测试对膜材料的结构和性能进行了表征。结果表明,复合膜中TiO2与PI两相在空间上结合紧密。含TiO2质量分数为22.3%的复合膜中TiO2颗粒尺寸为10nm左右;含TiO2质量分数为27.2%时,复合膜仍光学透明。复合材料的UV-Vis吸收表现出了量子尺寸效应。与纯PI膜相比,复合膜的耐化学介质性能和透气性能显著增强。当TiO2质量分数为22.3%时,复合膜的透H2系数从纯PI膜的2.857×10-15m3·m/(m2·s·Pa)增加到1.061×10-14m3·m/(m2·s·Pa),H2/N2和H2/CH4理想分离系数分别为187.5和143.2。
English
Preparation of Polyimide/Titania Nano-composite Membrane for Gas Separation
Abstract:
Polyimide/TiO2 nano-composite membranes for gas separation were prepared by a sol-gel method.The structure of the composite was characterized by FT-IR,SEM,TEM and UV-Vis measurements.Its chemical resistance and permeability towards H2,N2 and CH4 were examined.The results showed the existence of chemical bindings between TiO2 and the polyimide.The size of TiO2 was about 10 nm in the composite with TiO2 content of 22.3% (mass fraction) and the composite was still transparent when TiO2 amounted to 27.2% (mass fraction).The quantum size effect occurred in UV-Vis spectra of the composites.The chemical resistance and the gas permeability of the composites were greatly improved as compared with that of the pure polyimide.The H2 permeability of the composite membrane containing 27.2% of TiO2 increased to 1.061×10-14 m3·m/(m2·s·Pa) (the initial value was 2.857×10-15 m3·m/(m2·s·Pa)) and the ideal selectivity coefficients of H2/N2 and H2/CH4 were 187.5 and 143.2,respectively.
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Key words:
- polyimide/TiO2
- / nano-composite
- / quantum size effect
- / gas separation membrane
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