β型リン酸三カルシウム粒子分散強化ポリL乳酸複合材料の機械的特性評価

概要

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Bioactive ceramics β-tricalcium phosphate (β-TCP) particle dispersed bioabsorbable plastics poly-L-lactide (PLLA) composites have been expected to apply for the fracture fixations which have more biocompatibility than monolithic PLLA. In this study, β-TCP/PLLA composites containing three different β-TCP contents (4.8, 9.5, 14.3 wt%) were prepared by injection molding. The results of bending tests show bending strength decrease with increasing β-TCP contents. On the other hand, bending modulus increases with β-TCP contents. After immersion tests in PBS at 37℃ up to 8 weeks the mechanical properties were hardly degraded in all specimens. The results of fracture surface observation indicated that microscopic damage such as debonding between β-TCP and PLLA initiates at β-TCP agglomeration and grow with increasing loading. Analytical predictions of the relationship between stress and strain based on micromechanics considering the progress of β-TCP/PLLA debonding were in good agreement with experimental results.
一般社団法人日本機械学会の論文
2006-04-25