Microfiber aligned hollow fiber membranes from immiscible polymer solutions by phase inversion

Jun Tae Jung, Ho Hyun Wang, Jeong F. Kim, Seong Min Jeon, Sang Hyun Park, Won Hee Lee, Sun Ju Moon, Enrico Drioli, Young Moo Lee

Research output: Contribution to journalArticle

Abstract

In this study, we report for the first time a pioneering method to prepare membranes with a fibrous morphology via phase inversion with extremely high pore connectivity. Microfiber aligned hollow fiber membranes were prepared via a polymer blend solution consisting of poly (vinylidene fluoride) with polysulfone in PolarClean® as a green solvent. The microfiber structure appeared only when controlled phase separation was performed with polymer blends. A systematic analysis has revealed that the shear rate and the reduced capillary number (α) of a blend solution significantly affected the morphology of the final membrane. The fabricated fibrous membranes exhibited six-fold higher water productivity compared to the best electrospun membranes reported in the literature, yet they remain highly scalable.

Original languageEnglish
Article number118654
JournalJournal of Membrane Science
Volume617
DOIs
StatePublished - 2021 Jan 1

Keywords

  • Hollow fiber membrane
  • Microfiber alignment
  • Phase inversion
  • Polymer immiscible solution

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