Modification of ultrafiltration polyacrylonitrile membranes by sequential grafting of oppositely charged monomers: pH-dependent behavior of the modified membranes

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    Abstract

    The grafting of oppositely charged water-soluble monomers onto a polyacrylonitrile (PAN) ultrafiltration (UF) membrane and the consequent stratification processes were investigated by means of attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy. The grafting of monomers with sulfo-acidic groups was increased when it was conducted on a membrane previously grafted with the presence of oppositely charged amine groups increased the grafting of exposed to buffer solutions having different pH values, their ATR-FTIR spectra revealed that chemical changes had occurred both within the layers and on the surface. The pH-dependent behavior of the bilayered membranes showed that the first-layer grafts had interpenetrated, to a certain extent, into the second layer of the polyelectrolyte and vice versa.

    Original languageEnglish
    Pages (from-to)155-165
    Number of pages11
    JournalReactive and Functional Polymers
    Volume54
    Issue number1-3
    DOIs
    StatePublished - 1 Jan 2003

    Keywords

    • ATR-FTIR
    • Alternatively charged monomers
    • Grafting onto PAN
    • Layered membranes

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