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SEM images of the solvent vapor annealing (SVA)-treated PCL/PEO fibers (a,a’) and PCL/PEO@PDA of different modification time intervals (b,b’), 5 h; (c), 30 h; (d,d’), 45 h; (e) UV-vis spectra of the PDA solution and PCL/PEO@PDA-45 fiber composite.
