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Fig. 5 ATR-FTIR spectra of a pure PCL b chitosan/PCL (50/ 50 wt%) c chitosan/PCL (75/25 wt%) and d pure chitosan

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detector. The integrated absorbance of characteristic band for each compound was plotted to denionstrate its distribu-tion in a compcgite. It is critical to identify characteristic spectral bands for each component that can be used for constructing images for the distribution of a specific poly-mer. The amide II band at 1,560 cm^-1 (rangę used forgen-erating the image was 1.617-1,490 cm^-1) and the carbonyl band at 1,727 cm”¹ (1,740-1.710 cm^-1) were used to characterise chitosan and PCL, respectively. The surfactant span-80 (5 v/v%) which was used as the emulsifier in this study was also detected within wavenumbers ranging from 1.750 to 1,735 cm As shown in Fig. 6. the distribution of chitosan and PCL in both 25 and 50 wt% PCL composites was uniform at both surface and cross sections. Comparing the images generated for the specimen containing 25 wt^c/c PCL to the one with 50 wt% PCL. the reduction in amide II group absorbance was observed. which was attributed to the decrease of the eontent of chitosan in the blends. Meanwhile the absorbance of the corresponding band of PCL was