Remarkable change in the broadband electrical behavior of poly(vinylidene fluoride)-multiwalled carbon nanotube nanocomposites with the use of different processing routes

Autor(es)

Ferreira Santos, Joao Paulo ^[1] ; Carvalho, Benjamim de Melo ^[2] ; Suman Bretas, Rosario Elide ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Rodovia Washington Luis, Km 235, POB 676, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Estadual Ponta Grossa, Dept Mat Engn, Ave Gen Carlos Cavalcanti 4748, BR-84030900 Ponta Grossa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Polymer Science; v. 136, n. 17 MAY 5 2019.
• Citações Web of Science: 1

Resumo

Poly(vinylidene fluoride) (PVDF) nanocomposites have plenty of applications in the electronic realm. In this study, we produced nanocomposites based on PVDF and multiwalled carbon nanotubes (MWCNTs), with various MWCNT loadings, using three different processing routes: solution mixing, melt mixing, and electrospinning. The broadband electrical behavior of these nanocomposites was studied and compared via impedance spectroscopy. The morphologies of the nanocomposites were characterized by transmission electron microscopy and scanning electron microscopy. The results reveal that the electrical behaviors of the samples were completely different according to the processing route used. Solution mixing was the most suitable method for producing nanocomposites with the highest conductivities, at low MWCNT loadings, whereas electrospinning was the most suitable method for producing nanocomposites with the lowest dielectric permittivity. These differences were attributed to the different arrangements of the MWCNTs caused by the different processes. Although the solution-mixed samples exhibited long and twisted MWCNTs, the melt-mixed samples had shorter MWCNTs, and the electrospun samples had MWCNTs embedded and aligned inside the insulating polymer nanofibers. Thus, these results project a vast horizon for tailoring the structure and thereby the broadband electrical behavior of PVDF-MWCNT nanocomposites for different types of applications. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47409. (AU)

• Processo FAPESP: 13/03118-2 - Visualização, caracterização e manipulação de domínios ferroelétricos e magnéticos em multiferróicos
• Beneficiário: André Marino Gonçalves
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 14/17597-2 - Obtenção e estudo da estruturação de nanocompósitos híbridos baseados em copolímeros em bloco para aplicação em supercapacitores
• Beneficiário: João Paulo Ferreira Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/03667-4 - Eletrofiação de nanofibras cerâmicas para uso em nanocompósitos poliméricos
• Beneficiário: Rosario Elida Suman Bretas
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 15/23329-3 - Desenvolvimento de nanocompósitos poliméricos para diferentes aplicações em energia
• Beneficiário: Rosario Elida Suman Bretas
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/07296-2 - CDMF - Centro de Desenvolvimento de Materiais Funcionais
• Beneficiário: Elson Longo da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs