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The pH-responsive behaviour of poly(acrylic acid) in aqueous solution is dependent on molar mass
Open accessAbstract
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.
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“Polyacrylic acid (PAA), which is an anionic synthetic compound, can form pH-responsive hydrogel, swells/dissolves at pH higher than its pKa, and remains collapsed at acidic pH (pH < pKa) [123].”
From Review of Stimuli-Responsive Polymers in Drug Delivery and Textile Application (2019) · cites this paper as [123]
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Metadata
- Authors
- Swift, T., Swanson, L., Geoghegan, M., & Rimmer, S.
- Affiliations
- University of Bradford (GB)
- University of Sheffield (GB)
- Corresponding author
- Geoghegan, Mark
- Rimmer, Stephen
- Venue
- Soft Matter
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2016
- Volume
- 12
- Issue
- 9
- Pages
- 2542-2549
- ISSN
- 1744-683X (ISSN-L)
- 1744-6848
- OpenAlex
- W2288268375
- Cited by
- 455
- References
- 48
- Citations by year
- 2026: 43 · 2025: 48 · 2024: 52 · 2023: 49 · 2022: 46 · 2021: 57 · 2020: 47 · 2019: 46 · 2018: 30 · 2017: 31 · 2016: 6
- FWCI
- 25.76
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by
- Locations
- Soft Matter (publishedVersion, cc-by)
- PubMed (publishedVersion)
- White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
- Bradford Scholars (University of Bradford) (submittedVersion)
- Newcastle University ePrints (Newcastle Univesity) (cc-by)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Engineering and Physical Sciences Research Council
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Electrostatics and Colloid Interactions
- Physical Sciences › Chemistry › Organic Chemistry › Advanced Polymer Synthesis and Characterization
- Physical Sciences › Materials Science › Biomaterials › Hydrogels: synthesis, properties, applications
- Keywords
- poly(acrylic acid), pH-responsive polymers, molar mass dependence, conformational change, chain conformation, polymer diffusion, aqueous polymer solutions
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