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

Lookup NU author(s): Professor Mark GeogheganORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© 2016 The Royal Society of Chemistry.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.

Publication metadata

Author(s): Swift T, Swanson L, Geoghegan M, Rimmer S

Publication type: Article

Publication status: Published

Journal: Soft Matter

Year: 2016

Volume: 12

Issue: 9

Pages: 2542-2549

Online publication date: 29/01/2016

Acceptance date: 21/01/2016

Date deposited: 19/12/2019

ISSN (print): 1744-683X

ISSN (electronic): 1744-6848

Publisher: Royal Society of Chemistry


DOI: 10.1039/c5sm02693h


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