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Second derivate IR mappings of the drop cast surface (1) and the thin coating (F = 300 mJ/cm2) surfaces (2). Intensity distributions are (a) 2954 cm−1 (CH3 stretch), (b) 1739 cm−1(C=O carbonyl group), (c) 1450 cm−1 (assigned to the lactides –CH3 group), and (d) ≈1182 cm−1 (–C–O– bond stretching).
