OS1006 静水圧押出成形SCPLA/PLLA複合材料の圧縮破壊挙動に及ぼす加水分解の影響(OS10-2 ポリ乳酸とブレンドの力学特性,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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The biodegradable composite materials composed of stereocomplex poly-lactic acid short fibers (SAPLA) and poly-L-lactic acid matrix (PLLA) are one of the strong candidates of scaffold materials for a novel bone regeneration technology. In particular, the interfacial bonding condition between fillers and matrix is expected as excellent in these composite materials. In the present study, the static compressive properties and their change by immersion into pseudo-biological environment were evaluated for neat PLLA and SCPLA/PLLA composite molded by hydrostatic-pressure-extrusion. The anisotropy in compressive properties was scarcely caused by the hydrostatic-pressure-extrusion molding, and the compressive properties of composite were mainly governed by those of matrix resin. The compressive properties were gradually decreased by the increase of immersion time. The macroscopic fracture morphologies indicated that the main fracture process was tensile fracture caused by the Poisson's effect in both neat PLLA and SAPLA/PLLA composite. Finally, the fractographic observation was carried out, in order to discuss the fracture mechanism mesoscopically. It is suggested that the interface between SCPLAs and PLLA was well bonded, the fracture was initiated at matrix-rich portion, and the SCPLA fibers prevented the matrix-crack propagation.
一般社団法人日本機械学会の論文
2011-07-16