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Surface modification and characterization of the PLGA films. (a) SEM images of surface and cross section of PLGA, PLGA/BMP2, PLGA/MH, and PLGA/MH/BMP2. Scale bar = 100 µm. (b) FTIR wide scan (650–4000 cm−1) and narrow scan (2000–4000 cm−1) spectra. (c) TGA thermograms for each film (37−800℃). (d) The water contact angle images of each films and measurements.
