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SEM images of cryogenically fractured surfaces after TPS extraction with HCl solution for (a) PLLA-PEG-PLLA/unmodified TPS blend film and PLLA-PEG-PLLA/modified TPS blend films with CA contents of (b) 1.5 %wt, (c) 3 %wt, and (d) 4.5 %wt by magnifications of (left column) ×500 and (right column) ×1000 (bar scales = 50 µm and 10 µm for left and right columns, respectively).
