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Date of Publication:2022-10-06

Journal:膜科学与技术

Issue:2

Page Number:46-52

ISSN No.:1007-8924

Abstract:The asymmetric membranes were prepared by L-S phase inversion method.Optical microscopy was adopted to investigate the diffusion rate of non-solvent in casting solution.Light transmittance experiment,scanning electron microscopy and gas permeation test were used to investigate the effects of solvent type of the casting solution,casting solution concentration and evaporation time on the asymmetric membrane formation process.Results show that the pore structure of membrane formation process was affected significantly by technological conditions.Type of solvent affected the viscosity and intermiscibility of solvent and non-solvent,which caused the different diffusivity of non-solvent in casting solution and affected the pore structure formation during phase inversion process.Increasing the casting solution concentration caused the rise of viscosity and extension of evaporation time increased the dense membrane thickness which both decreased the diffusivity of non-solvent in casting solution and affected the pore structure formation during phase inversion process.

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