DES formulation for recycling synthetic fibre textile waste containing elastane Depope, Nika Depope, Al Archodoulaki, Vasiliki Maria Dabrowska, Alicja Lendl, Bernhard Mautner, Andreas Ipsmiller, Wolfgang Bartl, Andreas ddc:540 This study presents a sustainable and non-destructive recycling strategy for synthetic fibres, specifically polyethylene terephthalate (PET), polyamide 6 (PA6), polyamide 66 (PA66), and elastane (EL). Two deep eutectic solvents (DESs) were synthesised, enabling selective dissolution of EL without degrading the surrounding polymer matrices. The dissolved EL phase was subsequently recovered by centrifugation, demonstrating its potential for material reuse. Comprehensive characterisation confirmed that the process preserves fibre integrity. SEM imaging revealed no detectable changes in fibre morphology, while DSC and TGA analyses indicated that the thermal properties of both EL and synthetic polymers were preserved. ATR-FTIR spectroscopy verified the absence of measurable chemical modifications. Mechanical testing showed that solvent treatment did not compromise the tensile performance of PET, PA6, or PA66 fibres, confirming their suitability for fibre-to-fibre recycling. The recovered fibres were successfully re-extruded into continuous filaments, confirming their melt processability and enabling potential applications in textile yarns, technical fibres, nonwovens, and polymer components via melt-spinning or moulding. These results demonstrate that the proposed DES-based method offers a promising approach for the circular recycling of complex fibre blends and provides a viable pathway towards industrial implementation. Elsevier 2026 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_2df8fbb1 https://research-explorer.ista.ac.at/record/22614 Depope N, Depope A, Archodoulaki VM, et al. DES formulation for recycling synthetic fibre textile waste containing elastane. <i>Waste Management</i>. 2026;224. doi:<a href="https://doi.org/10.1016/j.wasman.2026.115736">10.1016/j.wasman.2026.115736</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.wasman.2026.115736 info:eu-repo/semantics/altIdentifier/issn/0956-053X info:eu-repo/semantics/altIdentifier/e-issn/1879-2456 info:eu-repo/semantics/altIdentifier/pmid/42456595 info:eu-repo/semantics/openAccess