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

Authors :
Thomas, Swift
Linda, Swanson
Mark, Geoghegan
Stephen, Rimmer
Source :
Soft matter. 12(9)
Publication Year :
2016

Abstract

Fluorescence spectroscopy on a series of aqueous solutions of poly(acrylic acid) containing a luminescent label showed that polymers with molar mass, Mn16.5 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.

Details

ISSN :
17446848
Volume :
12
Issue :
9
Database :
OpenAIRE
Journal :
Soft matter
Accession number :
edsair.pmid..........3134c0af726703e88f9208aeff1c1d57