Liquid structuring in fluoropolymer solutions induced by water

Jasper J. Michels, Hamed Sharifi Dehsari, Mohammad Mahdi Abolhasani, Kamal Asadi

Research output: Chapter or section in a book/report/conference proceedingChapter or section

Abstract

The water-repellent nature of ferro/piezoelectric fluoropolymers such as PVDF and P(VDF-TrFE) gives rise to a rich solution phase behavior, in particular, because these materials are typically processed from hygroscopic solvents. Water, either deliberately added or condensing into an evaporating fluoropolymer solution from the processing environment, leads to structuring through liquid-liquid phase separation (demixing) into a polymer-rich and a polymer poor phase. Using ternary Flory-Huggins theory in combination with models for liquid-vapor mass transfer, as well as diffusive mass transport, we reveal that the phase-separated morphology is likely determined during the early stages of demixing. Hence, the point of demixing in composition space determines the structure size. In the case of electrospinning of fluoropolymer fibers, this point can be controlled by the deliberate addition of water to the spinning solution. In the case of film casting, one may exert control by tuning the humidity of the processing environment.

Original languageEnglish
Title of host publicationOrganic Ferroelectric Materials and Applications
Place of PublicationFrance
PublisherElsevier Masson
Pages357-373
Number of pages17
ISBN (Electronic)9780128215517
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • Condensation
  • Evaporation
  • Modeling
  • Phase diagrams
  • Solution processing
  • Vapor-induced phase separation

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

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