resumo
The development of magnetoactive scaffolds based on piezoelectric polymers is of great interest due to their ability to exert a magnetoelectric effect, their flexibility, and biocompatibility in various prospective applications. This study describes fabrication of novel electrospun magnetoactive scaffolds based on poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF-TrFE)] loaded with a high content (20 or 25 wt%) of magnetite nanoparticles modified by citric acid (Fe3O4-CA) and data on their structure and physicochemical, mechanical, and magnetic properties as well as a piezoelectric response. The suspension method gave a uniform nanoparticles' distribution in the electrospun scaffolds without any noticeable agglomeration. Raman and infrared spectroscopy and X-ray diffraction analysis indicated that the fabricated pure scaffolds and composite P(VDF-TrFE)/Fe3O4-CA scaffolds contain both piezoactive phases (beta and gamma). The composite scaffolds doped with 20 or 25 wt% of Fe3O4CA nanoparticles were found to have the highest saturation magnetization, 12.7 and 14.1 emu/g, respectively, superior to that of other PVDF-Fe3O4-based magnetoactive scaffolds. Besides, the incorporation of 20 or 25 wt% of Fe3O4-CA nanoparticles substantially decreased total crystallinity of the piezopolymer scaffolds from 60.7% to 46.9% and 42.7%, respectively. Addition of 20 wt% of Fe3O4-CA nanoparticles also diminished ultimate strength and Young's modulus but improved elongation at break. Meanwhile, in composite P(VDF-TrFE)/Fe3O4-CA scaffolds loaded with 20 wt% of the magnetic filler, the piezoresponse was similar to that of pure P(VDF-TrFE) scaffolds. Such changes in properties are explained by the interaction between P(VDF-TrFE) polymer chains and the surface of Fe3O4-CA nanoparticles via hydrogen bonds and dipolar bonds.
palavras-chave
POLY(VINYLIDENE FLUORIDE); PIEZOELECTRIC RESPONSE; PVDF; BEHAVIOR; PHASES; FILMS; NANOFIBERS; EFFICIENT; SURFACE
categoria
Polymer Science
autores
Botvin, VV; Shlapakova, LE; Mukhortova, YR; Wagner, DV; Gerasimov, EY; Romanyuk, KN; Surmeneva, MA; Kholkin, AL; Surmenev, RA
nossos autores
Andrei Kholkin
Investigador Jubilado
Konstantin Nikolaevich Romanyuk
Investigador JúniorProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
agradecimentos
The authors thank the central laboratories of Tomsk Polytechnic University (Analytical Center) for the XPS measurements. HRTEM studies were carried out using the facilities of the shared research center "National center of investigation of catalysts" at the Boreskov Institute of Catalysis. The research was conducted at Tomsk Polytechnic University. Financial support from the Ministry of Science and Higher Education of Russia is acknowledged (grant agreement #075-15-2021-588 of June 1, 2021) . A part of this work was developed within the scope of the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the Portuguese Foundation for Science and Technology/MCTES. It is also funded by national funds (OE), through FCT - Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the