修飾高分子の分子量がハイブリッド界面制御HAp/PLA複合材料の破壊特性に及ぼす影響

抄録

The composite material composed of the hydroxyapatite (HAp) particles and poly-lactic acid (PLA) is one of the candidates of the scaffold materials for bone regeneration. Previously, we had proposed the hybrid interface control method, where the HAp particles are efficiently coated with pectin and chitosan utilizing the electrostatic interaction and the reaction process control, for HAp/PLA composite materials, resulting in the improvement of their fracture properties. In this study, we aimed to evaluate the effect of the molecular weight of the modification polymers on the tensile strength of the hybrid-interface-controlled HAp/PLA composites. As a result, the lower molecular weight of chitosan improved the tensile strength before the hydrolysis. In addition, the lower molecular weight of chitosan accelerated the degradation in the tensile strength. Its mechanism was discussed based on the interfacial microstructural viewpoint, suggesting the possibility of the control of the hydrolysis property by the change of the molecular weight of the modification polymers.