Study on the Degradation Property of nHAC/PLA Composite Wire Material

Nano-crystal hydroxyapatite/collagen (nHAC) composites have good biological properties, and polylactic acid is a kind of polymer with good biocompatibility, both of which have been widely used in the field of bone repair. The nHAC/PLA composite wires studied in this paper were prepared from the combination of polylactic acid and nanocrystal hydroxyapatite/collagen, which was used as the raw material of 3D printed bone prosthesis, and the degradation performance of nHAC/PLA composite wires was studied. The experiment was carried out by in vitro degradation method, and the weight loss rate of the material in different periods was analyzed. The surface topography of the material was observed by laser confocal microscopy. FTIR and DSC were used to characterize the material before and after degradation. The results show that the material degradation occurs during the experiment, which is the decrease of tensile property, the reduction of material weight and the change of surface topography. In addition, no changes in molecular structure and other substances were produced during the degradation process.