Surface modification of PVDF membranes by grafting of a vinylphosphonium compound

Der’e Jan, Joong S. Jeon, Srini Raghavan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


A technique to incorporate positively charged groups onto the surface of microporous polyvinylidene fluoride membrane filters has been developed. In this method, a water-soluble vinyltriphenylphosphonium bromide compound was grafted onto polyvinylidene fluoride membranes using 60Co γ-irradiation. The electrical characteristics of prepared membranes were measured by streaming potential and anionic dye challenge tests. The compatibility of these charge-modified membranes with ultrapure water was also investigated. Results show that these charge-modified membranes are characterized by a positive zeta potential in the pH range from 4 to 9.3. From the dye challenge tests the density of positively charged sites was calculated to be approximately five times larger than that of unmodified polyvinylidene fluoride. The modified membranes released less than 1 ppb of total organic carbon (TOC) into ultrapure water and thus appear to have potential for use in DI water systems.

Original languageEnglish (US)
Pages (from-to)1157-1168
Number of pages12
JournalJournal of Adhesion Science and Technology
Issue number10
StatePublished - 1994


  • PVDF membrane
  • charge modification
  • filtration
  • surface modification
  • vinyltriphenylphosphonium bromide
  • zeta potential

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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