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Abstract
The influence of the cast-solvent on the microstructure and on the permeation properties of dense copolyimide membranes. A series of 10wt. % solutions of a copolyimide based on two dianhydrides and a fluorinated diamine were cast in order to prepare dense membranes. The influence of the cast-solvent on the membrane properties was studied by considering both m-cresol and N-methyl pyrrolidone (NMP). The microstructural analyses performed using X-ray diffraction, density measurements and UV/visible spectrophotometry show significant differences in free volume and chain packing. The permeability properties of both types of films are found to be significantly different. These differences can be used to optimize the permeability properties in these systems. To cite this article: É. Pinel et al., C. R. Chimie 6 (2003).
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