OS1004 リン酸三カルシウム/ポリL乳酸複合材料の圧縮挙動に及ぼす擬似生体環境浸漬及びひずみ速度の影響(OS10-1 医療用無機/有機複合材料の力学特性,OS-10 医療用高分子系複合材料の構造と力学特性)

概要

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Bioactive ceramics/poly-L-lactic acid (PLLA) composites have been expected as a material for the bone fracture fixations which have more biocompatibility than monolithic PLLA. In this study, β-tricalcium phosphate (β-TCP)/PLLA composites containing three different β-TCP contents (5, 10, 15 wt%) were prepared by injection molding and tested to clarify the effect of immersion in simulated body environment and strain rates on the mechanical properties. These composites were immersed in phosphate buffered solution, and then compressive tests were performed at the strain rates ranging from 10^<-3> to 10^<-1>/s. In the results of these tests, β-TCP/PLLA composites showed that their Young's modulus have no dependence on the strain rate and their compressive strength increased with increasing strain rates. After 16 weeks immersion, compressive strength of 15 wt% composites were decreased slightly at strain rate of 10^<-1>/s. After 24 weeks immersion, compressive strength of 5, 10 and 15 wt% composites were decreased.
2011-07-16