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

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

    Research output: Contribution to journalArticlepeer-review

    53 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)2221-2225
    Number of pages5
    JournalComposites Part A: Applied Science and Manufacturing
    Issue number12
    Publication statusPublished - Dec 2006

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Mechanics of Materials


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