Influence of the addition of PVP on the morphology of asymmetric polyimide phase inversion membranes

Effect of PVP molecular weight

Seong Hyun Yoo, Jong Hak Kim, Jae Young Jho, Jongok Won, Yong Soo Kang

Research output: Contribution to journalArticle

104 Citations (Scopus)

Abstract

A macrovoid-free, porous membrane with a sponge-like structure was obtained by phase inversion of a polyimide (PI)/γ-butyrolactone (GBL)/water system, whereas a membrane with a finger-like structure was obtained from a PI/N-methyl-2-pyrrolidinone (NMP)/water system. In this study, the effect of the molecular weight of poly(vinyl pyrrolidone) (PVP) additive (Mw: 360k and 40k) in two systems on membrane morphology has been investigated by the differences in phase separation rates and miscibility gaps. On addition of PVP into the PI casting solutions, the two systems exhibited significantly different membrane morphologies; the former augmented macrovoid formation while the latter suppressed formation of finger-like structures. The membrane morphology and the phase separation rate significantly depend on the molecular weight of PVP in PI/NMP/water system whereas those do insignificantly in PI/GBL/water system. The cloud points representing the miscibility gap do not depend on the molecular weight of PVP in both systems very much. Therefore, it is suggested that the morphology change in the PI/NMP/water system is mostly due to the change in the phase separation rate caused by the change in the solution viscosity upon addition of PVP. However, in the PI/GBL/water system, the molecular weight effect of PVP is not as significant as in the PI/NMP/water system, and the morphology change seems to be primarily due to the change in the miscibility gap.

Original languageEnglish
Pages (from-to)203-207
Number of pages5
JournalJournal of Membrane Science
Volume236
Issue number1-2
DOIs
Publication statusPublished - 2004 Jun 15

Fingerprint

polyimides
Polyimides
molecular weight
Molecular Weight
Molecular weight
inversions
membranes
Membranes
Water
miscibility gap
water
Phase separation
Solubility
Pyrrolidinones
Porifera
Viscosity
Casting
viscosity
N-methylpyrrolidone

All Science Journal Classification (ASJC) codes

  • Filtration and Separation
  • Polymers and Plastics

Cite this

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title = "Influence of the addition of PVP on the morphology of asymmetric polyimide phase inversion membranes: Effect of PVP molecular weight",
abstract = "A macrovoid-free, porous membrane with a sponge-like structure was obtained by phase inversion of a polyimide (PI)/γ-butyrolactone (GBL)/water system, whereas a membrane with a finger-like structure was obtained from a PI/N-methyl-2-pyrrolidinone (NMP)/water system. In this study, the effect of the molecular weight of poly(vinyl pyrrolidone) (PVP) additive (Mw: 360k and 40k) in two systems on membrane morphology has been investigated by the differences in phase separation rates and miscibility gaps. On addition of PVP into the PI casting solutions, the two systems exhibited significantly different membrane morphologies; the former augmented macrovoid formation while the latter suppressed formation of finger-like structures. The membrane morphology and the phase separation rate significantly depend on the molecular weight of PVP in PI/NMP/water system whereas those do insignificantly in PI/GBL/water system. The cloud points representing the miscibility gap do not depend on the molecular weight of PVP in both systems very much. Therefore, it is suggested that the morphology change in the PI/NMP/water system is mostly due to the change in the phase separation rate caused by the change in the solution viscosity upon addition of PVP. However, in the PI/GBL/water system, the molecular weight effect of PVP is not as significant as in the PI/NMP/water system, and the morphology change seems to be primarily due to the change in the miscibility gap.",
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Influence of the addition of PVP on the morphology of asymmetric polyimide phase inversion membranes : Effect of PVP molecular weight. / Yoo, Seong Hyun; Kim, Jong Hak; Jho, Jae Young; Won, Jongok; Kang, Yong Soo.

In: Journal of Membrane Science, Vol. 236, No. 1-2, 15.06.2004, p. 203-207.

Research output: Contribution to journalArticle

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T1 - Influence of the addition of PVP on the morphology of asymmetric polyimide phase inversion membranes

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AU - Yoo, Seong Hyun

AU - Kim, Jong Hak

AU - Jho, Jae Young

AU - Won, Jongok

AU - Kang, Yong Soo

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