Incorporation of an Intermediate Polyelectrolyte Layer for Improved Interfacial Polymerization on PAI Hollow Fiber Membranes

Maria A. Restrepo, Mehrdad Mohammadifakhr, Johannes Kamp, Krzysztof Trzaskus, Antoine J.B. Kemperman, Joris de Grooth, Hendrik D.W. Roesink, Hannah Roth, Matthias Wessling*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

In a single-step spinning process, we create a thin-walled, robust hollow fiber support made of Torlon® polyamide-imide featuring an intermediate polyethyleneimine (PEI) lumen layer to facilitate the integration and covalent attachment of a dense selective layer. Subsequently, interfacial polymerization of m-phenylenediamine and trimesoyl chloride forms a dense selective polyamide (PA) layer on the inside of the hollow fiber. The resulting thin-film composite hollow fiber membranes show high NaCl rejections of around 96% with a pure water permeability of (Formula presented.) LMH/bar. The high success rate of fabricating the thin-film composite hollow fiber membrane proves our hypothesis of a supporting effect of the intermediate PEI layer on separation layer formation. This work marks a step towards the development of a robust method for the large-scale manufacturing of thin-film composite hollow fiber membranes for reverse osmosis and nanofiltration.

Original languageEnglish
Article number741
JournalMembranes
Volume13
Issue number8
DOIs
Publication statusPublished - Aug 2023

Keywords

  • chemistry in a spinneret
  • composite hollow fiber
  • interfacial polymerization
  • polyamide-imide
  • polyelectrolyte interlayer

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