Relationship between microstructure and fracture behavior of bioabsorbable HA/PLLA composites

Mitsugu Todo, Sang Dae Park, Kazuo Arakawa, Yasuharu Takenoshita

研究成果: Contribution to journalArticle

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抜粋

Hydroxyapatite particles of four different shapes, that is, micro, nano, spherical and plate, were used to fabricate hydroxyapatite filled poly(l-lactic acid) (HA/PLLA) composites. Effects of HA particle shape on the fracture behavior of HA/PLLA were investigated by mode I fracture testing, fracture surface measurement and scanning electron microscopy. It was found that the micro-HA/PLLA has the highest critical energy release rate, GIC, with the largest surface roughness, while GIC of the nano-HA/PLLA was lowest corresponding to the smallest surface roughness. The micro-HA/PLLA composites exhibited interfacial debonding and local ductile deformation of the PLLA matrix, indicating higher fracture energy and therefore, the highest GIC. On the other hand, the nano-HA/PLLA composites showed brittle fracture surface due to nano-scale interaction between PLLA fibrils and primary HA particles, corresponding to lower fracture energy and hence the lowest GIC.

元の言語英語
ページ(範囲)2221-2225
ページ数5
ジャーナルComposites Part A: Applied Science and Manufacturing
37
発行部数12
DOI
出版物ステータス出版済み - 12 1 2006

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Mechanics of Materials

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