Influence of MWCNT aspect ratio on the rheological, electrical, electromagnetic shielding, and mechanical properties of polycarbonate melt mixed nanocomposites

Autor(es)

dos Anjos, Erick Gabriel Ribeiro ; Brazil, Tayra Rodrigues ; Morgado, Guilherme Ferreira de Melo ; Montagna, Larissa Stieven ; Braga, Natalia Ferreira ; Antonelli, Eduardo ; Marini, Juliano ; Rezende, Mirabel Cerqueira ; Passador, Fabio Roberto

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF POLYMER RESEARCH; v. 30, n. 2, p. 16-pg., 2023-02-01.

Resumo

Multi-wall carbon nanotubes (MWCNTs) have received particular attention for preparing multifunctional polymer nanocomposites with engineering polymer matrices, such as polycarbonate (PC). This effort seeks to unite electrical, mechanical, and electromagnetic interference shielding effectiveness (EMI SE) properties in one unique material. Different commercial grades of MWCNTs have recently been available, so understanding how they affect the nanocomposite performance is indispensable. Thus, in this work, two MWCNTs with different aspect ratios (S-MWCNT with an aspect ratio of 158 and L-MWCNT with an aspect ratio of 600) were evaluated as nanofillers to improve the electrical, electromagnetic, and mechanical properties of PC melt mixed nanocomposites prepared by extrusion. PC/MWCNT nanocomposites with different contents of both MWCNTs were prepared (0.5, 1.0, 1.5, 2.0, and 2.5 wt%) and characterized by scanning electron microscopy, oscillatory rheological, impedance spectroscopy, electromagnetic interference shielding effectiveness (EMI SE), and mechanical tests. The S-MWCNT, with lower length and diameter than the L-MWCNT, propitiated a better dispersion in the PC matrix resulting in better electrical and EMI SE properties. The rheological analyses reaffirmed easier dispersion behavior, with an evident change for the solid-like behavior (G'>G") in low contents of S-MWCNT. The content of 2.0 wt% has been established as an optimum for both MWCNTs, considering the AC electrical conductivity (> 10(-4) S/cm) and higher EMI SE (14 dB for S-MWCNT and 11 dB for L-MWCNT) for this content. (AU)

• Processo FAPESP: 21/10136-3 - Desenvolvimento de filamentos de nanocompósitos de abs/nanocargas carbonosas para confecção de carcaça protetora de circuitos eletrônicos por manufatura aditiva
• Beneficiário: Erick Gabriel Ribeiro dos Anjos
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 20/12501-8 - Desenvolvimento de embalagens antiestáticas e biodegradáveis baseadas em compósitos híbridos de poliésteres com adição de carbono vítreo e nanoplacas de grafeno
• Beneficiário: Fabio Roberto Passador
• Modalidade de apoio: Auxílio à Pesquisa - Regular