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Issue 9, 2016
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The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass

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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.

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

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Supplementary files

Article information


Submitted
01 Nov 2015
Accepted
21 Jan 2016
First published
29 Jan 2016

This article is Open Access

Soft Matter, 2016,12, 2542-2549
Article type
Paper

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

T. Swift, L. Swanson, M. Geoghegan and S. Rimmer, Soft Matter, 2016, 12, 2542
DOI: 10.1039/C5SM02693H

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