Effects of mineral fillers addition and preparation method on the morphology and electrical conductivity of epoxy/multiwalled carbon nanotube nanocomposites

Autor(es)

Tokobaro, Paulo Eduardo Asito ^[1] ; Larocca, Nelson Marcos ^[1] ; Backes, Eduardo Henrique ^[1] ; Pessan, Luiz Antonio ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Via Washington Luiz, Km 235, BR-13565905 Sao Carlos - Brazil

• Tipo de documento: Artigo Científico
• Fonte: POLYMER ENGINEERING AND SCIENCE; v. 61, n. 2 DEC 2020.
• Citações Web of Science: 0

Resumo

This study investigated the correlation between the electrical conductivity and the micro and nanomorphology of multiwalled carbon nanotubes (MWCNTs)/epoxy nanocomposites with and without the inorganic fillers montmorillonite (MMT), sepiolite and calcium carbonate (CaCO3). The nanocomposites were prepared by dispersing the MWCNT and fillers through ultrasonication directly in the resin or solvent. For nanocomposites without fillers, the compositions prepared with solvent demonstrated higher electrical conductivities, which correlate with a microscale morphology formed by networks of highly interconnected MWCNT agglomerates. The addition of MMT induced a deleterious effect on the electrical conductivity of the nanocomposites since this filler hinders the formation of MWCNT agglomerate networks. The effect of sepiolite on electrical conductivity is also negative, but in this case, nonmorphological effects are likely of greater importance. The addition of CaCO3 improved the electrical conductivity of the binary nanocomposites under specific conditions. For this filler, a synergic effect was achieved for the composition prepared with solvent, which resulted in an approximately sixfold increase in electrical conductivity relative to the nanocomposite without filler. (AU)

• Processo FAPESP: 17/09609-9 - Desenvolvimento de scaffolds bioinspirados de PLA/cargas cerâmicas bioativas via impressão 3D
• Beneficiário: Luiz Antonio Pessan
• Modalidade de apoio: Auxílio à Pesquisa - Regular