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Polymers
Volume 15
Issue 24
10.3390/polym15244662
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Article

Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites

by
Juliene Oliveira Campos de França
*,
Quezia dos Santos Lima
,
Mariana Martins de Melo Barbosa
,
Ana Lívia Fernandes Fonseca
,
Guilherme de França Machado
,
Sílvia Cláudia Loureiro Dias
and
José Alves Dias
*
Laboratory of Catalysis, Chemistry Institute (IQ-UnB), University of Brasília, Campus Universitário Darcy Ribeiro–Asa Norte, Brasília 70910-900, DF, Brazil
*
Authors to whom correspondence should be addressed.
Polymers 2023, 15(24), 4662; https://doi.org/10.3390/polym15244662
Submission received: 18 October 2023 / Revised: 24 November 2023 / Accepted: 28 November 2023 / Published: 11 December 2023
(This article belongs to the Special Issue Polymers and Metals from Nano- to Macro-Scale: Composite Materials and Coatings)
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Abstract

Nanocomposites based on poly(lactic acid) (PLA) and magnetite nanoparticles (MNP-Fe3O4) show promise for applications in biomedical treatments. One key challenge is to improve the stabilization and dispersion of MNP-Fe3O4. To address this, we synthesized MNP-Fe3O4/PLA nanocomposites using ultrasound mediation and a single iron(II) precursor, eliminating the need for surfactants or organic solvents, and conducted the process under ambient conditions. The resulting materials, containing 18 and 33 wt.% Fe3O4, exhibited unique thermal behavior characterized by two mass losses: one at a lower degradation temperature (Td) and another at a higher Td compared to pure PLA. This suggests that the interaction between PLA and MNP-Fe3O4 occurs through hydrogen bonds, enhancing the thermal stability of a portion of the polymer. Fourier Transform Infrared (FT-IR) analysis supported this finding, revealing shifts in bands related to the terminal –OH groups of the polymer and the Fe–O bonds, thereby confirming the interaction between the groups. Raman spectroscopy demonstrated that the PLA serves as a protective layer against the oxidation of MNP-Fe3O4 in the 18% MNP-Fe3O4/PLA nanocomposite when exposed to a high-power laser (90 mW). Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) analyses confirmed that the synthetic procedure yields materials with dispersed nanoparticles within the PLA matrix without the need for additional reactants.
Keywords: magnetite; magnetic nanoparticles (MNP); poly(lactic acid)-PLA; polymerization based on D,L-lactic acid; nanocomposites MNP-PLA; sonochemical synthesis magnetite; magnetic nanoparticles (MNP); poly(lactic acid)-PLA; polymerization based on D,L-lactic acid; nanocomposites MNP-PLA; sonochemical synthesis

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MDPI and ACS Style

de França, J.O.C.; Lima, Q.d.S.; Barbosa, M.M.d.M.; Fonseca, A.L.F.; Machado, G.d.F.; Dias, S.C.L.; Dias, J.A. Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites. Polymers 2023, 15, 4662. https://doi.org/10.3390/polym15244662

AMA Style

de França JOC, Lima QdS, Barbosa MMdM, Fonseca ALF, Machado GdF, Dias SCL, Dias JA. Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites. Polymers. 2023; 15(24):4662. https://doi.org/10.3390/polym15244662

Chicago/Turabian Style

de França, Juliene Oliveira Campos, Quezia dos Santos Lima, Mariana Martins de Melo Barbosa, Ana Lívia Fernandes Fonseca, Guilherme de França Machado, Sílvia Cláudia Loureiro Dias, and José Alves Dias. 2023. "Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites" Polymers 15, no. 24: 4662. https://doi.org/10.3390/polym15244662

APA Style

de França, J. O. C., Lima, Q. d. S., Barbosa, M. M. d. M., Fonseca, A. L. F., Machado, G. d. F., Dias, S. C. L., & Dias, J. A. (2023). Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites. Polymers, 15(24), 4662. https://doi.org/10.3390/polym15244662

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