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Accelerated Hydrolytic Degradation of PLA/Magnesium Composite Films: Material Properties and Stem Cell Interaction
Valentina Fabi1, Maria Luisa Valicenti2, Franco Dominici3
1Department of Economics, Engineering, Society and Business Organization (DEIM), University of Tuscia, Largo dell'Università snc, 01100 Viterbo, Italy.
Polymers
|August 14, 2025
Summary
Surface modification of magnesium (Mg) particles in poly(L-lactide) (PLA) composites enhanced degradation resistance. These modified PLA/Mg films maintained biocompatibility and osteogenic potential, crucial for biomedical applications.
Area of Science:
- Biomaterials Science
- Polymer Chemistry
- Materials Engineering
Background:
- Poly(L-lactide) (PLA) is a biodegradable polymer with potential in biomedical applications.
- Magnesium (Mg) incorporation into PLA can enhance mechanical properties but may affect degradation rates.
- Controlling the degradation of PLA/Mg composites is essential for tailored applications.
Purpose of the Study:
- To investigate the effect of surface modification on magnesium particles on the hydrolytic degradation of poly(L-lactide) (PLA)/magnesium (Mg) composite films.
- To understand how surface treatments influence the degradation behavior and characteristics of PLA composites.
- To assess the biocompatibility and osteogenic potential of modified PLA/Mg films.
Main Methods:
- Accelerated hydrolytic degradation studies at 60 °C in pH 7.4 phosphate-buffered solution for 7 weeks.
- Monitoring degradation through mass loss, water absorption, thermal analysis, and Raman spectroscopy.
- In vitro testing on human bone marrow multipotent mesenchymal/stromal cells to evaluate biocompatibility and osteogenic potential.
Main Results:
- All composite films showed over 90% mass loss after 7 weeks of degradation.
- PLA/5MgTT and PLA/5MgPEI composite films exhibited enhanced resistance to degradation.
- Surface modification of Mg particles, via thermal treatment or polyethylenimine (PEI) coating, conferred protective effects.
- Modified films demonstrated biocompatibility and osteogenic potential comparable to control samples.
Conclusions:
- Surface modification of magnesium particles significantly influences the hydrolytic degradation of PLA/Mg composites.
- Specific surface treatments can improve the degradation resistance of PLA/Mg films.
- The enhanced degradation resistance does not negatively impact the biocompatibility or osteogenic potential of the modified films.
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