Thickness Dependence of Macrovoid Evolution in Wet Phase-Inversion Asymmetric Membranes

Dongfei Li; Tai Shung Chung; Jizhong Ren; Rong Wang

doi:10.1021/ie034264g

Thickness Dependence of Macrovoid Evolution in Wet Phase-Inversion Asymmetric Membranes

Dongfei Li, Tai Shung Chung^*, Jizhong Ren, Rong Wang

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

98 Scopus citations

Abstract

Following an inspiration from Vogrin et al. (J. Membr. Sci. 2002, 207, 139), we have investigated the thickness dependence of macrovoid evolution during the phase inversion of asymmetric flat membranes and observed, for the first time, a critical structure-transition thickness, L_c, which indicates a transition of the membrane morphology from a spongelike to a fingerlike structure with an increase in membrane thickness. Below L _c, the membranes show a fully spongelike cross-sectional structure, whereas above L_c, the membranes exhibit a mainly fingerlike macrovoid structure. Two binary solutions are employed in this study: 20 wt % polyethersulfone/N-methyl-2-pyrrolidone (NMP) and 20 wt % BTDA-MDI/TDI co-polyimide/NMP solutions. Their corresponding critical thicknesses, L _c, are 1.5 ± 0.4 and 11 ± 2 μm, respectively.

Original language	English (US)
Pages (from-to)	1553-1556
Number of pages	4
Journal	Industrial and Engineering Chemistry Research
Volume	43
Issue number	6
DOIs	https://doi.org/10.1021/ie034264g
State	Published - Mar 17 2004
Externally published	Yes

ASJC Scopus subject areas

General Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

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title = "Thickness Dependence of Macrovoid Evolution in Wet Phase-Inversion Asymmetric Membranes",

abstract = "Following an inspiration from Vogrin et al. (J. Membr. Sci. 2002, 207, 139), we have investigated the thickness dependence of macrovoid evolution during the phase inversion of asymmetric flat membranes and observed, for the first time, a critical structure-transition thickness, Lc, which indicates a transition of the membrane morphology from a spongelike to a fingerlike structure with an increase in membrane thickness. Below L c, the membranes show a fully spongelike cross-sectional structure, whereas above Lc, the membranes exhibit a mainly fingerlike macrovoid structure. Two binary solutions are employed in this study: 20 wt % polyethersulfone/N-methyl-2-pyrrolidone (NMP) and 20 wt % BTDA-MDI/TDI co-polyimide/NMP solutions. Their corresponding critical thicknesses, L c, are 1.5 ± 0.4 and 11 ± 2 μm, respectively.",

author = "Dongfei Li and Chung, {Tai Shung} and Jizhong Ren and Rong Wang",

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T1 - Thickness Dependence of Macrovoid Evolution in Wet Phase-Inversion Asymmetric Membranes

AU - Li, Dongfei

AU - Chung, Tai Shung

AU - Ren, Jizhong

AU - Wang, Rong

PY - 2004/3/17

Y1 - 2004/3/17

N2 - Following an inspiration from Vogrin et al. (J. Membr. Sci. 2002, 207, 139), we have investigated the thickness dependence of macrovoid evolution during the phase inversion of asymmetric flat membranes and observed, for the first time, a critical structure-transition thickness, Lc, which indicates a transition of the membrane morphology from a spongelike to a fingerlike structure with an increase in membrane thickness. Below L c, the membranes show a fully spongelike cross-sectional structure, whereas above Lc, the membranes exhibit a mainly fingerlike macrovoid structure. Two binary solutions are employed in this study: 20 wt % polyethersulfone/N-methyl-2-pyrrolidone (NMP) and 20 wt % BTDA-MDI/TDI co-polyimide/NMP solutions. Their corresponding critical thicknesses, L c, are 1.5 ± 0.4 and 11 ± 2 μm, respectively.

AB - Following an inspiration from Vogrin et al. (J. Membr. Sci. 2002, 207, 139), we have investigated the thickness dependence of macrovoid evolution during the phase inversion of asymmetric flat membranes and observed, for the first time, a critical structure-transition thickness, Lc, which indicates a transition of the membrane morphology from a spongelike to a fingerlike structure with an increase in membrane thickness. Below L c, the membranes show a fully spongelike cross-sectional structure, whereas above Lc, the membranes exhibit a mainly fingerlike macrovoid structure. Two binary solutions are employed in this study: 20 wt % polyethersulfone/N-methyl-2-pyrrolidone (NMP) and 20 wt % BTDA-MDI/TDI co-polyimide/NMP solutions. Their corresponding critical thicknesses, L c, are 1.5 ± 0.4 and 11 ± 2 μm, respectively.

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U2 - 10.1021/ie034264g

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

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ER -

Thickness Dependence of Macrovoid Evolution in Wet Phase-Inversion Asymmetric Membranes

Abstract

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