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    The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass

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    Publication date
    2016-03
    Author
    Swift, Thomas
    Swanson, L.
    Geoghegan, M.
    Rimmer, Stephen
    Keyword
    Poly(acrylic acid); pH-responsive behaviour; Molar mass; pH-dependent diffusion; Conformational change
    Rights
    © 2016 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence
    Peer-Reviewed
    yes
    
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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.
    URI
    http://hdl.handle.net/10454/8425
    Version
    published version paper
    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
    Link to publisher’s version
    http://dx.doi.org/10.1039/C5SM02693H
    Type
    Article
    Collections
    Life Sciences Publications

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