Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6486164 | Biomaterials | 2015 | 10 Pages |
Abstract
Biodegradable poly-lactic acid (PLA) - based composites reinforced unidirectionally with high-strength magnesium alloy wires (MAWs) are fabricated by a heat-compressing process and the mechanical properties and degradation behavior are studied experimentally and theoretically. The composites possess improved strengthening and toughening properties. The bending strength and impact strength of the composites with 40Â vol% MAWs are 190Â MPa and 150Â kJ/m2, respectively, although PLA has a low viscosity and an average molecular weight of 60,000Â g/mol. The mechanical properties of the composites can be further improved by internal structure modification and interface strengthening and a numerical model incorporating the equivalent section method (ESM) is proposed for the bending strength. Micro arc oxidization (MAO) of the MAWs is an effective interfacial strengthening method. The composites exhibit high strength retention during degradation and the PLA in the composite shows a smaller degradation rate than pure PLA. The novel biodegradable composites have large potential in bone fracture fixation under load-bearing conditions.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Bioengineering
Authors
X. Li, C.L. Chu, L. Liu, X.K. Liu, J. Bai, C. Guo, F. Xue, P.H. Lin, Paul K. Chu,