529 加水分解を受けた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ひずみ速度の影響(高分子/高分子基複合材料(3),ものづくりにおける基礎研究と先端技術の融合)

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 and monolithic PLLA specimens were prepared by injection molding and tested to clarify the effect of hydrolysis and strain rates on the mechanical properties. These specimens 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, both β-TCP/PLLA composites and PLLA specimens showed that their modulus have no dependence on the strain rate and their peak stress increased with increasing strain rates. After 16 weeks immersion, peak stress of specimens were decreased slightly. After 24 weeks immersion, peak stress of non-annealing PLLA specimens were decreased with increasing strain rates at strain rate of 10^<-1>/s.
2010-11-27