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Figure S1. 1H Nuclear magnetic resonance spectrum of ibuprofen-loaded poly(trimethylene carbonate-co-ε-caprolactone) [P(TMC-CL)] fibres, showing the identification of ibuprofen characteristic peaks.

Figure S2. Full attenuated total reflectance Fourier transform infrared spectrum of ibuprofen (grey), ibuprofen-loaded poly(trimethylene carbonate-co-ε-caprolactone) [P(TMC-CL)] fibres (black) and P(TMC-CL) (red).

Figure S3. Overlay of spectra obtained from mapping experiments of ibuprofen-loaded poly(trimethylene carbonate-co-ε-caprolactone) [P(TMC-CL)] fibres prepared from (A) 1:0 dichloromethane (DCM)–N,N-dimethylformamide (DMF) and (B) 3:1 DCM–DMF solutions.

Figure S4. Standard calibration curve obtained for ibuprofen.

Figure S5. Fittings according to Higuchi model for drug release for fibres prepared from (A) 1:0 dichloromethane (DCM)–N,N-dimethylformamide (DMF), (B) 6:1 DCM:DMF and (C) 3:1 DCM–DMF.

Figure S6. Scanning electron microscopy photomicrographs of ibuprofen-loaded poly(trimethylene carbonate-co-ε-caprolactone) [P(TMC-CL)] fibres prepared from 1:0 dichloromethane (DCM)–N,N-dimethylformamide (DMF) solution (A) before and (B) after ibuprofen release.

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