Fourier Transform Infrared Studies on the Dissociation Behavior of Metal-Chelating Polyelectrolyte Brushes

The dissociation behavior of surface-grafted polyelectrolytes is of interest for the development of stimuli-responsive materials. Metal-chelating polyelectrolyte brushes containing acrylic acid (PAA) or hydroxamic acid (PHA) chelating moieties were grafted from the surface of polypropylene (PP). Fou...

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Published inACS applied materials & interfaces Vol. 6; no. 8; pp. 5383 - 5387
Main Authors Roman, Maxine J, Decker, Eric A, Goddard, Julie M
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 23.04.2014
Subjects
metal chelation
dissociation
poly(hydroxamic acid)
FTIR
polymer brushes
poly(acrylic acid)
pK a
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Summary:The dissociation behavior of surface-grafted polyelectrolytes is of interest for the development of stimuli-responsive materials. Metal-chelating polyelectrolyte brushes containing acrylic acid (PAA) or hydroxamic acid (PHA) chelating moieties were grafted from the surface of polypropylene (PP). Fourier transform infrared (FTIR) spectroscopy was used to determine the effective bulk pK a of the polyelectrolyte brushes (pK a bulk) and to characterize metal-chelating behavior. The pK a bulk values of PP-g-PAA and PP-g-PHA were 6.45 and 9.65, respectively. Both PP-g-PAA and PP-g-PHA exhibited bridging bidentate and chelating bidentate iron chelation complexes. This is the first reported determination of the pK a,bulk of surface-grafted poly(hydroxamic) acid.
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ISSN:1944-8244
1944-8252
DOI:10.1021/am501212g