Study of nanocomposites with carbon nanotubes and their tendency for carbon organization

• Autor(a) principal: Renda,C. G.
• Data de Publicação: 2022
• Outros Autores: Oliveira,C. de, Bertholdo,R.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Cerâmica (São Paulo. Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132022000100033
• topic: nanocomposites; modified phenolic resin; carbon nanotubes; graphitization; organized carbon

Abstract The carbon derived from the thermal treatment of modified phenolic resins (PR) tends to organize into graphitic lamellae or turbostratic carbon and is commonly considered non-graphitizable. In this study, nanocomposites were synthesized with modified phenolic resin (Novolac) used as the matrix and oxidized multi-walled carbon nanotubes (NTox) in amounts ranging from 0.3 to 2.5 wt% as a filler. Thermal gravimetric analysis (TGA), Raman spectroscopy, powder X-ray diffraction (XRD), scanning electron microscopy (SEM) with field emission gun (FEG), and transmission electron microscopy (TEM) were performed. By TGA, the PR-2.5 wt% nanocomposite showed less thermal degradation and higher stability when compared to the pure matrix after heat treatment up to 1000 °C. Graphitic carbon organization analysis by Raman spectroscopy, XRD, SEM/FEG, and TEM micrographs showed that the PR-2.5 wt% nanocomposite is suitable for technological applications, involving a carbon graphitization tendency.