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The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass
Swanson, L. Geoghegan, M. Rimmer, Stephen
Swanson, L.
Geoghegan, M.
Rimmer, Stephen
Publication Date
2016-03
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© 2016 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
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openAccess
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21/01/2016
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Abstract
Fluorescence spectroscopy on a series of aqueous solutions of poly(acrylic acid) containing a luminescent
label showed that polymers with molar mass, Mn < 16.5 kDa did not exhibit a pH responsive conformational
change, which is typical of higher molar mass poly(acrylic acid). Below this molar mass, polymers remained
in an extended conformation, regardless of pH. Above this molar mass, a pH-dependent conformational
change was observed. Diffusion-ordered nuclear magnetic resonance spectroscopy confirmed that low
molar mass polymers did not undergo a conformational transition, although large molar mass polymers
did exhibit pH-dependent diffusion.
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Citation
Swift T, Swanson L, Geoghegan M and Rimmer S (2016) The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass. Soft Matter, 12: 2542-2549
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