Effect of surface modification on interfacial behavior in bioabsorbable magnesium wire reinforced poly-lactic acid polymer composites

The mechanical behavior, corrosion mechanisms, and cytocompatibility at the interface of magnesium wires reinforced poly-lactic acid polymer composites were studied by in vitro degradation study of 180 days. Surface modification of Mg wires by plasma-electrolytic oxidation improved the interface she...

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Bibliographic Details
Published in:Npj Materials degradation 2023-08, Vol.7 (1), p.65-14, Article 65
Main Authors: Ali, Wahaaj, Echeverry-Rendón, Mónica, Kopp, Alexander, González, Carlos, LLorca, Javier
Format: Article
Language:English
Subjects:
639/301/1023/1025
639/301/54/993
Biocompatibility
By products
Chemistry and Materials Science
Composite materials
Corrosion
Corrosion and Coatings
Corrosion mechanisms
Corrosion rate
Degradation
Electrochemistry
Electrolytic cells
Hydrogen
Interfaces
Interfacial shear strength
Magnesium
Materials Science
Mechanical properties
Orthopedics
Oxidation
Polylactic acid
Polymer matrix composites
Polymers
Shear strength
Structural Materials
Transplants & implants
Tribology
Wire
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Summary:The mechanical behavior, corrosion mechanisms, and cytocompatibility at the interface of magnesium wires reinforced poly-lactic acid polymer composites were studied by in vitro degradation study of 180 days. Surface modification of Mg wires by plasma-electrolytic oxidation improved the interface shear strength from 10.9 MPa to 26.3 MPa which decreased to 8 MPa and 13.6 MPa in Mg/PLA and PEO-Mg/PLA composites, respectively, after 42 days of in vitro degradation. Cross-sections of the composite showed good cytocompatibility, although the cells tended to migrate towards the PLA regions and avoided the surface of the Mg wires. Corrosion of Mg wires (without surface modification) was very fast in composite while corrosion of surface-modified Mg wires was significantly reduced, hydrogen gas was suppressed and only 3% mass loss of Mg wires was found after 180 days. Finally, the corrosion mechanisms at interface were discussed for both composites.
ISSN:2397-2106
2397-2106
DOI:10.1038/s41529-023-00386-x