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IR spectra of composites and pure components. (a), curve a and (b) curve a: pure chitosan; (a) curve b and (b) curve c: pure HAP; (a) curve c and (b) curve e: PHB-HAP composite; (a) curve d and (b) curve d: composite with PHB : CHT = 1 : 3; (a) curve e and (b) curve b: pure PHB) (x-bending P–OH in hydroxyapatite).
