Microstructural investigation implies that the extremely high gas permselectivity (molecular sieving effect) of a carbonized polyimide membrane results from the decrease of the interplanar spacing and voids.
H. Suda and K. Haraya, J. Chem. Soc., Chem. Commun., 1995, 1179 DOI: 10.1039/C39950001179
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