Synthesis and characterization of sodalite–polyimide nanocomposite membranes
Li, D., Zhu, H.Y., Ratinac, K.R., Ringer, S.P. and Wang, H. (2009) Synthesis and characterization of sodalite–polyimide nanocomposite membranes. Microporous and Mesoporous Materials, 126 (1-2). pp. 14-19.
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Nanocomposite membranes are fabricated from sodalite nanocrystals (Sod-N) dispersed in BTDA-MDA polyimide matrices and then characterized structurally and for gas separation. No voids are found upon investigation of the interfacial contact between the inorganic and organic phases, even at a Sod-N loading of up to 35 wt.%. This is due to the functionalization of the zeolite nanocrystals with amino groups (double bond; length as m-dashSisingle bond(CH3)(CH2)3NH2), which covalently link the particles to the polyimide chains in the matrices. The addition of Sod-N increases the hydrogen-gas permeability of the membranes, while nitrogen permeability decreases. Overall, these nanocomposite membranes display substantial selectivity improvements. The sodalite–polyimide membrane containing 35 wt.% Sod-N has a hydrogen permeability of 8.0 Barrers and a H2/N2 ideal selectivity of 281 at 25 °C whereas the plain polyimide membrane exhibits a hydrogen permeability of 7.0 Barrers and a H2/N2 ideal selectivity of 198 at the same testing temperature.
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|Copyright:||© 2009 Elsevier Inc.|
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