Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour — Oak Academic Publishing
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Hybrid Composites of Phosphate Glass Fibre/Nano-Hydroxyapatite/Polylactide: Effects of Nano-Hydroxyapatite on Mechanical Properties and Degradation Behaviour
Ningbo Nottingham International Academy for the Marine Economy and Technology, University of Nottingham Ningbo China, Ningbo, China
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Ningbo Nottingham New Materials Institute, University of Nottingham Ningbo China, Ningbo, China
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Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo, China
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Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo, China
1 Ningbo Nottingham International Academy for the Marine Economy and Technology, University of Nottingham Ningbo China, Ningbo, China
2 Ningbo Nottingham New Materials Institute, University of Nottingham Ningbo China, Ningbo, China
3 Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo, China
4 Faculty of Science and Engineering, University of Nottingham Ningbo China, Ningbo, China
Hydroxyapatite/polylactide (HA/PLA) composites have been intensively investigated for their potential as biodegradable fixation devices to heal bone fractures. However, most of these composites failed to achieve a bone-mimicking level of mechanical properties, which is an essential demand of the targeted application. In this study, the nano-hydroxyapatite/polylactide composites were used as the matrix and continuous phosphate glass fibres (PGF) served as the major reinforcement to obtain the nano-HA/PGF/PLA hybrid composites. While the PGF volume fraction remained constant (25%), the nano-HA content (in weight) varied from 0% to 20%. As nano-HA loading increased, the flexural modulus of the composites increased from 8.70 ± 0.35 GPa to 14.97 ± 1.30 GPa, and the flexural strengths were enhanced from 236.31 ± 10.83 MPa to 310.55 ± 22.88 MPa. However, it is found that the degradation rates are higher with more nano-HA loaded. Enhanced water absorption ability, as well as increased voids in the composites is possible reasons for the accelerated degradation of composites with higher nano-HA loading. The hybrid composites possess mechanical properties that are superior to most of the HA/PLA composites in previous research while maintaining the biodegradability. With a proper loading of nano-HA in composites of 10 weight percent, the composites are also found with improved mechanical properties without catastrophic degradation. The composites developed in this study have great potential as biodegradable bone fixation device with enhanced load-bearing ability as confirmed and superior bioactivity as anticipated.
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