Estudo das propriedades elétricas e dielétricas de um nanocompósito polimérico a base de resina epóxi e nanotubos de carbono
Carregando...
Data
2022-07-15
Autores
Silvestre, Jane Ianuchauskas
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Estadual Paulista (Unesp)
Resumo
Neste trabalho foi estudado as propriedades elétricas e dielétricas de um nanocompósitos à base de resina epóxi (RE) e nanotubos de carbono de paredes múltiplas (MWCNT). As amostras foram preparadas com quantidades fixas de RE (3g) e diferentes concentrações mássicas de MWCNT (variando de 0,25 a 3%) e obtidas por meio do método casting. Foram realizadas análises elétricas por meio dos métodos duas pontas em corrente contínua e usando um analisador de impedância. As análises da condutividade elétrica dc demonstraram que uma transição isolante-semicondutor ocorreu no nanocompósitos RE/MWCNT entre as concentrações de 0,5 e 1% de MWCNT, ou seja, essa é a região de percolação onde ocorre a formação do primeiro caminho ininterrupto de MWCNT no interior do nanocompósito. As análises de condutividade elétrica ac demonstraram que as amostras apresentam características de sólidos, no qual à medida que a frequência do campo elétrico aumenta a condutividade elétrica ac também se torna maior. No entanto, para as amostras com concentrações superiores a 1% MWCNT, a condutividade real ac apresentou duas regiões bem definidas, isto é, uma dependente e outra independente da frequência. Similar comportamento foi observado para a impedância elétrica das amostras do nanocompósitos RE/MWCNT, uma vez, essa grandeza é inversamente proporcional a condutividade elétrica ac. Por fim, foi avaliado a permissividade dielétrica relativa das amostras do nanocompósitos RE/MWCNT, no qual foi possível observar que à medida que a concentração de MWCNT foi aumentada, também houve um aumento da dessa grandeza. Isso ocorre porque quanto maior a concentração de MWCNT no interior do nanocompósitos, maior também será a quantidade de portadores de cargas presos nas interfaces resina epóxi-MWCNT.
This work was studied as electrical and electrical properties of nanocomposites based on nanocomposites based on walled carbon nanotubes (MW). The samples were prepared with the prepared media corrections (3g) and the different CNTs (ranging from method 0.25 to %0.25 a can be obtained by casting). They were run multiple times using the methods twice in continuous running and using an impedance study using two methods. The stores of the first line of transition of MWCNT and 1% are formation that are formed by a transition of MWCNT and 1% that occur in the MWCNT region, or 1% that occur in the MWCNT region, or 1% of MWCNT in the inside the nanocomposite. Electrical conductivity measurements are important as most electrical conductivity characteristics, not which electrical field frequency measurement increases electrical conductivity also becomes. However, for samples with MW greater than 1%, the real conductivity presented two very distinct regions, that is, one dependent and the other independent of the frequency. Similar behavior was observed for the electrical impedance of the RE/MWCNT nanocomposite samples, since this magnitude is inversely proportional to the ac electrical conductivity. Finally, a relative dielectric permittivity of the RE/MWCNT of the nanocomposites was evaluated, not which it was possible to observe that the measurement of this measure of MWCNT was increased, there was also an increase in magnitude. The greater concentration of MWCNT occurs inside the nanocomposites, the greater will also be the amount of resin and that of loads as in the interfaces.
This work was studied as electrical and electrical properties of nanocomposites based on nanocomposites based on walled carbon nanotubes (MW). The samples were prepared with the prepared media corrections (3g) and the different CNTs (ranging from method 0.25 to %0.25 a can be obtained by casting). They were run multiple times using the methods twice in continuous running and using an impedance study using two methods. The stores of the first line of transition of MWCNT and 1% are formation that are formed by a transition of MWCNT and 1% that occur in the MWCNT region, or 1% that occur in the MWCNT region, or 1% of MWCNT in the inside the nanocomposite. Electrical conductivity measurements are important as most electrical conductivity characteristics, not which electrical field frequency measurement increases electrical conductivity also becomes. However, for samples with MW greater than 1%, the real conductivity presented two very distinct regions, that is, one dependent and the other independent of the frequency. Similar behavior was observed for the electrical impedance of the RE/MWCNT nanocomposite samples, since this magnitude is inversely proportional to the ac electrical conductivity. Finally, a relative dielectric permittivity of the RE/MWCNT of the nanocomposites was evaluated, not which it was possible to observe that the measurement of this measure of MWCNT was increased, there was also an increase in magnitude. The greater concentration of MWCNT occurs inside the nanocomposites, the greater will also be the amount of resin and that of loads as in the interfaces.
Descrição
Palavras-chave
MWCNT, Compósito Polimérico Condutor, Propriedades Elétricas, Epoxy Resin, MWCNT, Conductive Polymer Composite, Electrical Properties, Resinas epoxi, Nanotubos