Won, J Lee, HJ Kang, YS 2024-01-21T13:38:15Z 2024-01-21T13:38:15Z 2021-09-05 2000-08-15 0376-7388 https://pubs.kist.re.kr/handle/201004/141167 Macrovoid-free, sponge-like membranes with improved gas permeance were obtained from a heterogeneity-developed polyethersulfone (PES)/gamma-butyrolactone (gamma-BL) dope solution. The heterogeneity of the dope solution was developed with aging time and such a heterogeneity-developed cast solution film was immersed in a nonsolvent so that it would be coagulated. In this novel procedure, the heterogeneity developed was maintained until the moment of immersion in a coagulation medium. The effect of heterogeneity in dope polymer solution on the membrane morphology as well as on gas transport properties has been studied using light scattering, atomic force microscopy (AFM) and scanning electron microscopy (SEM). Detailed roughness analysis of surface images indicates that nascent PES membranes having a finger-like structure have deep surface valleys, whereas those having a sponge-like structure have a smooth surface. Low fluidity of the dope solution due to the heterogeneity developed resulted in the membrane morphology of a sponge-like structure with a smooth surface layer. (C) 2000 Elsevier Science B.V. All rights reserved. English ELSEVIER SCIENCE BV ATOMIC-FORCE MICROSCOPY LIGHT-SCATTERING SURFACE-STRUCTURE SPATIAL INHOMOGENEITY CROSS-LINKING CHARGED GELS GELATION The effect of dope solution characteristics on the membrane morphology and gas transport properties: 2. PES/gamma-BL system Article 10.1016/S0376-7388(00)00424-5 1 JOURNAL OF MEMBRANE SCIENCE, v.176, no.1, pp.11 - 19 JOURNAL OF MEMBRANE SCIENCE 176 1 11 19 scie scopus 000088411700002 2-s2.0-0034664225 Engineering, Chemical Polymer Science Engineering Polymer Science Article ATOMIC-FORCE MICROSCOPY LIGHT-SCATTERING SURFACE-STRUCTURE SPATIAL INHOMOGENEITY CROSS-LINKING CHARGED GELS GELATION polyethersulfone membrane heterogeneity gelation surface structure