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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. shu

Preparation of Polyimide/Titania Nano-composite Membrane for Gas Separation

DU Hong-Wei ^, ,
KONG Ying

1.
College of Chemistry and Chemical Engineering, University of Petroleum, Dongying 257061

Corresponding author: DU Hong-Wei,
Received Date: 6 August 2002
Available Online: 31 December 2002
Fund Project: 科技部国家重点基础研究发展规划项目(G2000026407) (G2000026407)山东省自然科学基金(097B02122) (097B02122)

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.
- polyimide/TiO₂,
- nano-composite,
- quantum size effect,
- gas separation membrane
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