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IR spectra of the electrospun PEO fibers (a), the electrospun PLA fibers (b and e), the as-spun PEO/PLA blend fibers (c), the blend fibers upon the removal of PEO (d), the PLA-PGS composite membrane (f), the composite membrane upon the removal of PLA (g), and the PGS solid sheet (h). Note that the all PGS samples were cured under 120 °C for 48 h.
