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Efeito de tratamentos químicos nas propriedades de superfície de fibras de carbono via cromatografia gasosa inversa

Authors: Moraes, Álvaro G. O.; Faria, Marisa; Silva, Fernanda W.; Cordeiro, Nereida M. A.; Amico, Sandro C.;

Efeito de tratamentos químicos nas propriedades de superfície de fibras de carbono via cromatografia gasosa inversa

Abstract

Em aplicações aeroespaciais emprega-se o conjunto resina epóxi e fibras de carbono. Essa fibra apresenta baixa afinidade com diversos polímeros, resultando em pouca molhabilidade pelas resinas. Entretanto, pode-se utilizar tratamentos de superfície para introduzir grupos funcionais e/ou aumentar sua área superficial. Um método recente e pouco explorado para caracterizar a superfície de fibras de carbono é a cromatografia gasosa inversa (CGI). Quando comparada à cromatografia gasosa convencional, na CGI a superfície do substrato é o material a ser investigado, enquanto a fase móvel apresenta propriedades bem definidas. O objetivo deste trabalho é estudar o efeito de diversos agentes de tratamento químicos nas propriedades de superfície de fibras de carbono base PAN comerciais. As fibras foram pré-tratadas com acetona, para removem sua encimagem, e posteriormente tratadas com ácidos (HCl, HNO3, H2SO4 ou CH3COOH), NH4OH ou H2O2. Tais agentes de tratamento se mostraram eficazes para a modificação de superfície das fibras de carbono, em termos de promover distintos graus de interações físicas e ácido-base.

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Portugal
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Keywords

Faculdade de Ciências Exatas e da Engenharia, Fibra de carbono, Cromatografia gasosa inversa, Atividade química, Tratamentos químicos, Propriedades de superfície, .

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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