Caracterização Morfológica de Nanomembranas de Poliamida-66 Dopadas com Grafeno Obtidas por Electrospinning
Morphological Characterization of Polyamide-66 Nanomembranes with Graphene Obtained by Electrospinning
Júnior, José de Ávila; Ávila, Antônio Ferreira; Triplett, Matt H
http://dx.doi.org/10.1590/S0104-14282012005000077
Polímeros: Ciência e Tecnologia, vol.23, n1, p.74-81, 2013
Resumo
Neste estudo, investigou-se a síntese de nanomembranas por eletrofiação (electrospinning). A poliamida-66 (PA-66) foi usada para estudar a influência dos parâmetros operacionais (concentração do polímero, diferença de potencial elétrico aplicada, vazão da solução, distância entre ponta da agulha e o coletor) na morfologia das nanofibras. Também foi estudado o efeito da adição de nanofolhas de grafeno na morfologia das nanofibras. Os resultados demonstraram que o diâmetro médio das nanofibras é diretamente proporcional à vazão, à concentração do polímero e à diferença de potencial elétrico aplicada. A adição de nanopartículas de base carbono fez com que o diâmetro médio das nanofibras aumentasse. Os diâmetros médios para as concentrações de grafeno de 0%, 1%, e 2% variaram de 57 nm (0%) até 141 nm (2%). No entanto, é importante salientar que os diâmetros médios das nanofibras obtidas estão 37% menores que aqueles reportados na literatura.
Palavras-chave
Electrospinning, nanofibers, nanomembranes, graphene, nanostructured composites
Abstract
This paper reports on the synthesis of polymeric nanomembranes produced by electrospinning. Polyamide-66 (PA-66) was used for studying the influence of fabrication parameters (polymer concentration, applied tension, solution flow rate, gap between needle and target) on the morphology of the nanofibers. Also investigated was the effect from adding graphene into the nanofiber. The average diameter was directly proportional to polymeric concentration, flow rate, and applied tension. The addition of graphene led to an increase in the average diameter, which ranged from 57 nm for the fibers in absence of graphene to 141 nm for a 2 wt. (%) of graphene added. It should be stressed, however, that the average diameters were 37% smaller than the values reported in the literature.
Keywords
Electrospinning, nanofibras, nanomembranas, grafeno, compositos nano-estruturados
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22. Heikkilä, P.; Harlin, A. – Polym. J., 44, p.3067 (2008).
23. Park, S.-W.; Bae, H.-S.; Xing, Z.-C.; Kwon, O. H.; Huh, M.-W. & Kang, I.-K. – J. Appl. Polym. Sci., 112, p.2320 (2009). http://dx.doi. org/10.1002/app.29520
24. Abramoff, M. D.; Magalhaes, P. J. & Ram, S. J. – Biophotonics International, 11, p.36 (2004).
25. He, J.-H.; Wan, Y.-Q.; Yu, J.-Y. – Fibers Polym., 9, p.140 (2008). http:// dx.doi.org/10.1007/s12221-008-0023-3
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27. Prevéy, P.S. – J. Thermal Spray Tech., 9, p.369 (2000). http://dx.doi. org/10.1361/105996300770349827
28. Li, Q.; Jia, Z.; Yang, Y.; Wang, L. & Guan, Z. – “Preparation and properties of poly(vinyl alcohol) nanofibers by electrospinning”, in: Proceedings of IEEE International Conference on Solid Dielectrics, p.215, Winchester – UK, jul. (2007). http://dx.doi.org/10.1109/ ICSD.2007.4290790
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30. Wang, C.; Ko, F. K. & Alcock, M. – “Nanoclay reinforced PLA nanocomposite by electrospinning”, in: Proceedings of 24th Annual ASC Technical Conference, p.1, Newark – USA, set. (2009).
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