530 ポリ乳酸スクリューの機械的特性に及ぼす成形条件の影響(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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The applications of the conventional bioabsorbable bone fixations are limited to low loaded region, because of their lower mechanical characteristics. In this study, poly-L-lactide (PLA) that is one of the bioabsorbable plastic is molded into screw shape, and the mechanical characteristics of the PLA screw are investigated. The PLA screw is prepared by forging a bar made by push-out molding. The effect of push-out molding condition on the stretching length is evaluated. It was observed that the PLA screw could be stretched in case of molding temperature more than 100℃. The mechanical properties, such as the pulled out strength, the shearing strength, and the twist strength were measured. Crystallinity was also measured. The result of the measurement was compared with that of forged screws. It was confirmed that the molecular orientation in the screw by extrusion was different from the screw by forging. Therefore the shearing strength of the screw of extrusion is higher than that of the screw of forging by 12.2 MPa.
一般社団法人日本機械学会の論文
2010-11-27