Phase-inversion poly(ether imide) membranes prepared from water-miscible/immiscible mixture solvents

Jyh Jeng Shieh, Tai Shung Chung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


By using water-miscible and water-immiscible solvents (N-methyl-2-pyrrolidone and methlyene chloride (MC)) in the casting solution to prepare poly(ether imide) (PEI) asymmetric membranes via a phase-inversion process, we have studied the flat membrane formation, membrane morphology, and gas separation performance in terms of PEI content, MC content, and standing time. In such a system, the immiscibility of MC with water plays a very important role in determining the final membrane morphology and performance. The influence of methylene chloride was shown in two aspects: (1) change of phase-inversion course and mechanisms; (2) post membrane structure change due to the interaction between PEI and methylene chloride. The silicone-coated PEI membranes exhibited a good membrane performance with O2 permeance of (1.3-9.3) × 10-6 cm3(STP)/cm2·s·cmHg and O2/N2 selectivity of 5.2-6.4. It was found, from the gas permeation and membrane morphology studies, that the separation was mainly attributed to the cellular structures (closed cells) beneath the membrane surface skin.

Original languageEnglish (US)
Pages (from-to)2650-2658
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Issue number7
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering
  • Industrial and Manufacturing Engineering


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