Abstract
A new type of asymmetric gas separation membrane having an ultrathin, essentially defect-free skin layer using diethylene glycol dimethylether (DGDE) as a dope solvent was developed. The asymmetric membrane made of 6FDA-BAAF polyimide consisted of an ultrathin skin layer supported by a sponge-like porous substructure. The skin layer was essentially defect-free and had a thickness of 40-60 nm. The formation of such ultrathin skin layer was contributed to the mixing properties of the dope solvent and water as the quench medium. Solvents such as DGDE are miscible with water; however, a sharp interface between DGDE and water forms during the initial stages of the quench step. The ultrathin skin layer was possibly formed by solidification at such interface.
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