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

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 w...

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Bibliographic Details
Published in:Reactive & functional polymers 2003, Vol.54 (1), p.155-165
Main Author: Belfer, S
Format: Article
Language:English
Subjects:
Alternatively charged monomers
Applied sciences
ATR-FTIR
Exact sciences and technology
Exchange resins and membranes
Forms of application and semi-finished materials
Grafting onto PAN
Layered membranes
Polymer industry, paints, wood
Technology of polymers
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Summary: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.
ISSN:1381-5148
DOI:10.1016/S1381-5148(02)00191-8