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oai:docta.ucm.es:20.500.14352/50662026-04-28T09:11:59Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Multigner, Marta author Morales, Irene author Giacomone, Fernando author Presa Muñoz De Toro, Patricia Marcela De La author Benavente, Rosario author Torres, Belén author Mantovani, Diego author Rams, Joaquín author 2021-08 To modulate the properties of degradable implants from outside of the human body represents a major challenge in the field of biomaterials. Polylactic acid is one of the most used polymers in biomedical applications, but it tends to lose its mechanical properties too quickly during degradation. In the present study, a way to reinforce poly-L lactic acid (PLLA) with magnetic nanoparticles (MNPs) that have the capacity to heat under radiofrequency electromagnetic fields (EMF) is proposed. As mechanical and degradation properties are related to the crystallinity of PLLA, the aim of the work was to explore the possibility of modifying the structure of the polymer through the heating of the reinforcing MNPs by EMF within the biological limit range f center dot H < 5 center dot x 10_(9) Am_(-1) center dot s_(-1). Composites were prepared by dispersing MNPs under sonication in a solution of PLLA. The heat released by the MNPs was monitored by an infrared camera and changes in the polymer were analyzed with differential scanning calorimetry and nanoindentation techniques. The crystallinity, hardness, and elastic modulus of nanocomposites increase with EMF treatment. http://dx.doi.org/10.3390/ma14154300 1996-1944 10.3390/ma14154300 https://hdl.handle.net/20.500.14352/5066 http://dx.doi.org/10.3390/ma14154300 https://www.mdpi.com/ Modulation of crystallinity through radiofrequency electromagnetic fields in PLLA/magnetic nanoparticles composites: A proof of concept