Iron(III) ion reinforced P(NiPAAm-co-AA) beads as tunable smart organogels
Citation Link: https://doi.org/10.15480/882.18078
Publikationstyp
Journal Article
Date Issued
2026-08-13
Sprache
English
TORE-DOI
Journal
Citation
Polymer International (in Press): (2026)
Publisher DOI
Publisher
Wiley
P(NiPAAm-co-AA) organogel beads were prepared by UV-induced droplet polymerization and mechanically reinforced through treatment with iron(III) chloride. Energy-dispersive X-ray spectroscopy mapping revealed a structure generation dependent on the amount of iron incorporation: beads with a low iron(III) loading have a core–shell architecture; high loadings result in a more homogeneous distribution of the ions over the particle volume. Fourier transform infrared analysis and proton release indicate coordination of iron(III) ions to formed carboxylic entities in the copolymer. A colorimetric thiocyanate assay allowed us to quantify the iron uptake, identifying a limit at a ratio of Fe3+ to COOH entities of approximately 1:3.8. The compressive Young's modulus of the 5 mm beads increased by a factor of 378 from 6.1 kPa in the parent gel to 2.3 MPa in the Fe3+-saturated beads. The gels show a highly reversible shrinkage and swelling during solvent exchange between ethanol and ethyl acetate. The reinforced beads with a low and a high Fe3+ content conditioned in ethanol undergo a shrinkage of their volume after immersing in ethyl acetate of 38% and 25%, respectively; the time constants for shrinkage increase most significantly with the iron content; the rate of swelling is comparable. No iron(III) leaching was detected over multiple swelling–shrinkage cycles. © 2026 The Author(s). Polymer International published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
DDC Class
540: Chemistry
620.11: Engineering Materials
Publication version
publishedVersion
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Name
Polymer International - 2026 - Gmeiner - Iron III ion reinforced P NiPAAm‐co‐AA beads as tunable smart organogels.pdf
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Main Article
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2.66 MB
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