Synthesis of polymer-grafted hydroxyapatite nanofiber for improving mechanical properties and dispersion in polylactic acid composite
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초록
내용
Hydroxyapatite (HA) is the main mineral constituent in human bones and has attracted much attention for biomedical applications. Because of its biocompatibility and osteoconductivity, many researches about the composite of biodegradable polymer and HA composite have been made for implant materials. However, typical HA rod has lowered the mechanical properties in the polymer composite. In this study, HA nanofiber (HA NF) with an aspect ratio of 70 to 100 was synthesized to enhance the mechanical properties, and polylactic acid (PLA)/HA NF composite was fabricated. PLA was additionally grafted to HA NF to improve the dispersion in the polymer matrix and interfacial adhesion. XRD, FT-IR and XPS were carried out for HA NF synthesis and polymer grafting. Mechanical properties such as flexural modulus and strength of the composite were measured. Morphology of the composite was measured to confirm the dispersion of HA NF in polymer matrix.