Researchers have successfully characterized the PLA-Mn composite filaments, focusing on their thermal, mechanical, and biological properties. The study utilized techniques such as DSC, MFI, FTIR, FESEM, and in vitro degradation tests to analyze the characteristics of the PLA-Mn scaffolds.
The thermal analysis revealed that the addition of Mn particles did not significantly alter the glass transition temperature of the composite filaments. However, Mn particles acted as nucleating agents, reducing the cold crystallization temperature and enhancing the crystallinity of the PLA-Mn composites.
Melt flow index results showed a significant increase in flowability with the addition of Mn particles, leading to improved printability of the filament. The FTIR analysis confirmed that Mn particles did not form chemical bonds with PLA, but were physically dispersed among the polymer chains.
FESEM analysis provided insights into the distribution of Mn particles within the composite filaments, showing a more homogeneous distribution with higher Mn content. Additionally, the surface roughness of the PLA-Mn filaments increased with the addition of Mn particles, impacting the mechanical properties of the printed scaffolds.
Mechanical testing demonstrated that the PLA-7Mn composite scaffolds exhibited higher compressive modulus and ultimate compressive strength compared to pure PLA scaffolds. The improved mechanical properties were attributed to the direct reinforcing effect of Mn particles and the enhanced interlayer adhesion in the printed parts.
Biological evaluation of the scaffolds revealed that the PLA-7Mn composite scaffolds exhibited better cytocompatibility and cell proliferation compared to pure PLA scaffolds. The incorporation of Mn particles enhanced the wettability and water absorption capacity of the scaffolds, promoting cell attachment and proliferation.
Overall, the study highlighted the potential of PLA-Mn composite scaffolds for tissue engineering applications, showcasing their favorable mechanical, biological, and degradation properties compared to other PLA-metal composites. The findings contribute to the development of advanced biodegradable materials for biomedical applications.
