Development of a defect-free 6FDA-durene asymmetric hollow fiber and its composite hollow fibers

Tai-Shung Chung*, E. Ronald Kafchinski, Rohitkumar Vora

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations

Abstract

We have developed 6FDA-durene polyimide and poly(4-vinylpyridine) (PVP)/6FDA-durene composite hollow fibers. The 6FDA-durene fiber was defect-free and had a selectivity of 4.3-5.1 for O2/N2. It had an average permeance for O2 of ≈ 240×10-6 cm3 (STP)/cm2 cmHg and its dense layer thickness was ≈ 2000-3000 μm. The dense layer location was at the outer surface. This fiber was wet-spun directly from an in-situ imidization dope consisting of 14.94 wt% 6FDA-durene in a (70.24/21.5/7.51/0.75) N-methyl-2-pyrrolidone (NMP)/propionic acid (PA)/β-picoline/propionic anhydride solvent mixture. The fiber diameter was ≈500 μm with a wall thickness ≈50-70 μm. The PVP/6FDA-durene composite fiber had a selectivity of 6.9 for O2/N2 and a permeance for O2 of 14.5×10 cm3 (STP)/cm2 s cmHg. The newly developed technology suggests, for the first time, that a defect-free hollow fiber can be produced from a modified Lewis acid:base complex dope. Compared to most other conventional hollow fiber fabrication processes, our approach has many advantages because that (1) it is simpler and more economical, (2) spins fibers at low temperatures, (3) employs a dope directly from polymerization, and (4) requires no secondary operations, such as silicone coating and curing.

Original languageEnglish (US)
Pages (from-to)21-36
Number of pages16
JournalJournal of Membrane Science
Volume88
Issue number1
DOIs
StatePublished - Mar 9 1994

Keywords

  • air separation
  • composite membrane
  • hollow fiber
  • membrane fabrication
  • polyimide

ASJC Scopus subject areas

  • Filtration and Separation
  • Polymers and Plastics

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