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Custodio, et al.
A B

Figure 3. (A) Experimental density and (B) true porosity of the 3D printed polylactic acid /hydroxyapatite composites.

Figure 4. Fourier transform infrared spectra of hydroxyapatite (Hap), polylactic acid (PLA), and the 3D printed PLA/HAp composite
(15 wt. %).

1181 cm , 1127 cm , and 1080 cm are identified as 565 cm (PO bending), and 960 cm (PO stretching).
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the backbone of ester groups of PLA . Furthermore, Carbonate ions were faintly present at 870 cm −1[11,13] .
[20]
1748 cm pertains to C=O stretching vibrations , the The high calcining temperature of 1100°C in the HAp
[21]
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peak at 1045 cm for the OH bending, while the 1200– synthesis has caused the removal of water (as suggested
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1000 cm refers to C-O stretching . by the absence of 3600–3200 cm OH stretch). The
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[22]
Peaks coming from HAp are generally from phosphate visibility of the structuring OH was identified at 635 cm
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groups, such as 1090 cm , 1030 cm , 600 cm , and fingerprint region, indicating a better powder-polymer
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International Journal of Bioprinting (2021)–Volume 7, Issue 1 117