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

Description

Yes / 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. / Engineering and Physical Sciences Research Council (EPSRC) funded CASE award PhD. Part funded by flocculant manufacturer SNF (UK) Ltd.

Links & Downloads

1. 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
2. http://hdl.handle.net/10454/8425
3. https://doi.org/10.1039/C5SM02693H

Tags

Poly(acrylic acid)

pH-responsive behaviour

Molar mass

pH-dependent diffusion

Conformational change

Additional Fields

Identifer	oai:union.ndltd.org:BRADFORD/oai:bradscholars.brad.ac.uk:10454/8425
Date	2016 January 1921
Creators	Swift, Thomas, Swanson, L., Geoghegan, M., Rimmer, Stephen
Source Sets	Bradford Scholars
Language	English
Detected Language	English
Type	Article, Published version
Rights	© 2016 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence, CC-BY