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Citation

Alghamdi, Amjad S. and Hine, Peter J. and Ries, Michael (2025) Data for Dissolution of Different Animal Hair Yarn in 1-Ethyl-3-methylimidazolium Acetate. University of Leeds. [Dataset] https://doi.org/10.5518/1620¹

Dataset description

The partial dissolution of cashmere and merino wool yarns in the ionic liquid 1-ethyl-3-methylimidazolium acetate was studied, both with and without pretreatment of the yarns using sodium bisulfite. The cross-sections of both yarn fibers were analyzed using optical microscopy for different dissolution times and temperatures. It was found that the dissolution of cashmere yarn (CY) and merino wool yarn (WY) has two competing processes, one rate limited by disulfide bonds and the other rate limited by hydrogen bonds. The yarn dissolution obeyed time-temperature superposition. From this, two activation energies for each yarn were obtained, one with respect to low temperature (LT) and one for high temperature (HT), ECY LT = 110 ± 12 kJ/mol, ECY HT = 61 ± 6 kJ/mol, EWY LT = 124 ± 14 kJ/mol and EWY HT = 35 ± 1 kJ/mol. The crossover temperature between the low and high temperature regimes was found to be 70°C. The reducing agent (sodium bisulfite) was used to cleave the disulfide bonds in CY and WY. FTIR spectroscopy provided evidence that the disulfide bonds were in fact cleaved during this pretreatment. A single linear regime (instead of two) was found on the Arrhenius graphs of the pretreated cashmere (PCY) and the pretreated merino wool yarn (PWY), strongly confirming our hypothesis that at low temperatures the disulfide bonds determined the rate of dissolution. The subsequent dissolution activation energies were found to be reduced from the low temperature activation energies for the CY and WY, with their values being EPCY = 62 ± 4 kJ/mol and EPWY = 66 ± 3 kJ/mol respectively. With further analysis, the self-diffusion coefficient of [C2mim][OAc] for the CY, PWY and PCY dissolution systems were quantified, and compared to the self-diffusion coefficient of pure [C2mim][OAc] measured using NMR.

Keywords:	Animal hair keratin; ionic liquid; dissolution; time-temperature superposition; activation energy, biopolymers, composites
Divisions:	Faculty of Engineering and Physical Sciences > School of Physics and Astronomy2
Related resources:	Location Type https://doi.org/10.1021/acsomega.5c030003 Publication https://eprints.whiterose.ac.uk/id/eprint/227201/4 Publication
License:	Creative Commons Attribution 4.0 International (CC BY 4.0)
Date deposited:	06 May 2025 07:35
URI:	https://archive.researchdata.leeds.ac.uk/id/eprint/14065
Additional details Additional details Creators or authors: Creators ORCID Other ID Email Primary affiliation Primary affiliation ID Primary affiliation ID type Secondary affiliation Secondary affiliation ID Secondary affiliation ID type Alghamdi, Amjad S. https://orcid.org/0009-0006-2826-50026 University of Leeds https://ror.org/024mrxd33 ror Hine, Peter J. University of Leeds https://ror.org/024mrxd33 ror Ries, Michael https://orcid.org/0000-0002-8050-32007 University of Leeds https://ror.org/024mrxd33 ror Type of data: Dataset Publication date: 2025 Resource language: English Metadata language: English Publisher: University of Leeds Contact email: M.E.Ries@leeds.ac.uk8 Last Modified: 05 Jun 2025 15:36

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