3. Results and discussion
3.1. Morphology
Morphology of the nanocomposites was observed by transmission electron microscopy. Fig. 1, Fig. 2, Fig. 3 and Fig. 4 depict spherical HAP particles in the size range of nearly 10 to 100 nm dispersed as single or partially agglomerated particles within the PLA matrix. A halo around HAP particles can be related to interface between PLA phase and HAP particles as a result of interaction between the two phases. The interaction between carbonyl group in PLA and OH group in HAP have been studied by FTIR spectroscopy (Dadbin and Naimian, 2013 and Zhou et al., 2007).