Phase behavior and mechanism of membrane formation for polyimide/DMSO/water system

Jong Hak Kim, Byoung Ryul Min, Jongok Won, Hyun Chae Park, Yong Soo Kang

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

A macrovoid-free, sponge-like porous membrane was prepared from polyimide/DMSO/water system, whereas a finger-like membrane was obtained from a polyimide/NMP/water system by phase inversion. The sponge-like membrane structure was investigated by the thermodynamics and kinetics of the phase separation process. The rates of phase separation for both systems were similar, but their phase diagrams were significantly different. The distinct features of the phase diagram for the polyimide/DMSO/water system are: (1) extremely narrow miscibility gap, (2) close gelation point to the binodal curve, and (3) almost parallel tie-line passing through the gelation point to the polymer-solvent axis. These properties hinder the phase separation process to proceed further, i.e. the growth of the polymer-lean phase is, thus frozen or stopped in the early stages. Therefore, the membrane morphology will be determined at an earlier stage in the polyimide/DMSO/water system than polyimide/NMP/water, resulting in a macrovoid-free, sponge-like membrane.

Original languageEnglish
Pages (from-to)47-55
Number of pages9
JournalJournal of Membrane Science
Volume187
Issue number1-2
DOIs
Publication statusPublished - 2001 Jun 15

Fingerprint

Phase behavior
Dimethyl Sulfoxide
polyimides
Polyimides
membranes
Membranes
Porifera
Water
Phase separation
water
gelation
Gelation
Phase diagrams
Polymers
phase diagrams
membrane structures
Membrane structures
miscibility gap
polymers
Thermodynamics

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

Cite this

Kim, Jong Hak ; Min, Byoung Ryul ; Won, Jongok ; Park, Hyun Chae ; Kang, Yong Soo. / Phase behavior and mechanism of membrane formation for polyimide/DMSO/water system. In: Journal of Membrane Science. 2001 ; Vol. 187, No. 1-2. pp. 47-55.
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Phase behavior and mechanism of membrane formation for polyimide/DMSO/water system. / Kim, Jong Hak; Min, Byoung Ryul; Won, Jongok; Park, Hyun Chae; Kang, Yong Soo.

In: Journal of Membrane Science, Vol. 187, No. 1-2, 15.06.2001, p. 47-55.

Research output: Contribution to journalArticle

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