Abstract
In the present study, the effects of interphase on the mechanical properties of β-tricalcium phosphate (β-TCP) particle-dispersed bioabsorbable poly(lactic acid) (PLA) composites were investigated. In order to improve interfacial strength between PLA and β-TCP, the surface of β-TCP was modified with L-lactic acid (LLA) monomer. The weight ratios of LLA to β-TCP are selected as 1.5, 3, 4.5, 6, 7.5%. Tensile strength decreased with the incorporation of β-TCP to PLA, whereas the tensile strength of composites was improved in the case of modification with the weight ratio of 3%. From acoustic emission measurements, initial interfacial debonding was also suppressed up to 3%. From finite elemental analysis, elastic modulus of interphase is about 30–70% of that of PLA and elastic modulus of the composites do not depend on interphase thickness. From the stress distributions at initial debonding onset, it is clarified that interfacial debonding is caused by shear stress between particle and interphase and interfacial shear strength seems to be about 20 MPa.
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