Study of epoxy/CNT nanocomposites prepared via dispersion in the hardener
AUTOR(ES)
Pizzutto, Caio Enrico, Suave, Jaqueline, Bertholdi, Jonas, Pezzin, Sérgio Henrique, Coelho, Luiz Antonio Ferreira, Amico, Sandro Campos
FONTE
Materials Research
DATA DE PUBLICAÇÃO
03/06/2011
RESUMO
In this study, carboxylated (SWCNT-c) and pristine (SWCNT) single-walled carbon nanotubes were randomly dispersed in a hardener prior to mixing it with an epoxy resin. The influence of several parameters on the dispersion process were investigated. The produced samples were characterized by infrared spectroscopy, differential scanning calorimetry, dilatometry, dynamic mechanical analysis, scanning electron microscopy and mechanical testing (tensile, flexural and microhardness). The results obtained with the nanocomposites with SWCNT-c suggested that the lowest time and amplitude of sonication improved the mechanical properties. The use of a solvent (acetone) was important to improve dispersion, ultimately increasing microhardness and Young's Modulus up to 32%. Nanocomposites with 0.25 wt. (%) SWCNT-c presented superior mechanical properties compared to those with 0.50 wt. (%) SWCNT. Two simple mathematical models (rule of mixtures and Halpin-Tsai) were used to predict Young's Modulus of the composites yielding results very close to the experimental ones.
Documentos Relacionados
- Electrical, Thermal and Mechanical Properties of Epoxy/CNT/Calcium Carbonate Nanocomposites
- Compósitos epóxi/nanotubos de carbono preparados com dispersão de reforço no endurecedor
- Synthesis of Graphene Oxide and Functionalized CNT Nanocomposites Based on Epoxy Resin
- Effect of the hardener to epoxy monomer ratio on the water absorption behavior of the DGEBA/TETA epoxy system
- Relationship between the dielectric and mechanical properties and the ratio of epoxy resin to hardener of the hybrid thermosetting polymers