| Abstract [eng] |
Nanocrystalline Hydroxyapatite (HAP) Synthesis, Formation of Polylactic Acid (PLA)-HAP Composite and Inverstigation.The carbonated hydroxyapatite (cHAP) nanocrystalline powder synthesis via wet chemistry approach from calcium acetate and ammoniumhydrogenphosphate precursors together with croslinking agent of polyethyleneglycol, poly(vinylalcohol) and triethanolamine. Thermal decomposition of gels and formation of nanocrystalline cHAP was evaluated by thermal analysis mass spectrometry and dilatometry measurements. The effect of organic additives on the phase purity and particle sizes of cHAP was examined and is addressed. Phase purity, crystallinity and carbonate ion content of the apatite powders were evaluated by X-ray diffraction and FT-IR spectroscopy. Further we present the preparation of polylacticacid (PLA)-cHAP composite material from synthesised phase pure cHAP and melted PLA by mechanical mixing at 220-235 °C. Topographical structuring of PLA-cHAP composite surfaces was performed by direct laser writing (DLW). Microstructured surfaces and the apatite distribution within the composite and formed grooves were evaluated using optical and electron microscopyte techniques. |
