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

Author(s)

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

Affiliation

^[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

• Document type: Journal article
• Source: Journal of Applied Polymer Science; v. 136, n. 17 MAY 5 2019.
• Web of Science Citations: 1

Abstract

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)

• FAPESP's process: 13/03118-2 - Visulization, Characterization and Manipulation of Ferroelectric and Magnetic Domains in Multiferroics
• Grantee: André Marino Gonçalves
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 14/17597-2 - Hybrid nanocomposites based on block copolymers for application in supercapacitors
• Grantee: João Paulo Ferreira Santos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/03667-4 - Electrospinning of ceramic nanofibers for polymeric nanocomposites
• Grantee: Rosario Elida Suman Bretas
• Support Opportunities: Scholarships abroad - Research
• FAPESP's process: 15/23329-3 - Development of polymeric nanocomposites for different applications in energy
• Grantee: Rosario Elida Suman Bretas
• Support Opportunities: Regular Research Grants
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC