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http://dx.doi.org/10.3795/KSME-A.2007.31.7.732

Effect of Melt-mixing Conditions on Fracture Properties of Bioabsorbable HA/PLLA Composite Materials  

Park, Sang-Dae (고려대학교 의과대학 의공학교실)
Lee, Deok-Bo (엔엔사이언스(주) 고장분석연구소)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.7, 2007 , pp. 732-738 More about this Journal
Abstract
Effects of melt-mixing conditions on fracture properties of hydroxyapatite filled bioabsorbable poly(L-lactic acid)(HA/PLLA) composites was investigated by measuring the firacture toughness value of HA/PLLA composites prepared under different mixing time and rotor speed. The fracture surface morphology was also examined by profile measurement and scanning electron microscopies. It was found that the fracture toughness of HA/PLLA composites decreases due to decrease of ductile deformation of PLLA matrix and debonding of interfaces with increase of the rotor speed and mixing time. Effect of mixing process on neat PLLA was also assessed, and it was found that the fracture toughness of PLLA decreases due to disappearance of multiple craze formation and increase of defects. Such thermal and shear-stress degradation were found to be the primary mechanisms of the degradation of HA/PLLA composites during melt-mixing process.
Keywords
Poly(L-lactic acid); Hydroxyapatite; Melt-Mixing; Bioabsorbable Composite Materials;
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