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

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Author(s):
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
Total Authors: 9
Document type: Journal article
Source: JOURNAL OF POLYMER RESEARCH; v. 30, n. 2, p. 16-pg., 2023-02-01.
Abstract

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)

FAPESP's process: 21/10136-3 - DEVELOPMENT OF FILAMENTS FOR ADDITIVE MANUFACTURING OF ABS WITH DIFFERENT CARBON MATERIALS FOR ELECTRONIC HOUSING
Grantee:Erick Gabriel Ribeiro dos Anjos
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 20/12501-8 - Development of antistatic and biodegradable packages based on hybrid polyester composites with the addition of glassy carbon and graphene nanoplates
Grantee:Fabio Roberto Passador
Support Opportunities: Regular Research Grants