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Natural fibers characterization by inverse gas chromatography
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Orientador(es)
Resumo(s)
Vegetable fibers can be considered as naturally occurring composites, consistingmainly of cellulose, lignin
and hemicellulose. Their properties are significantly affected by many factors such as variety, climate,
harvesting and maturity, among others. Thus, prior to their application, the fibers should be properly
characterized. In the present study, inverse gas chromatography was used to study the surface properties
of several cellulosic fibers and the effect of an alkaline treatment. Dispersive surface energy ranged from
38.41 mJ/m2 for piassava to 52.39 mJ/m2 for assai. The studied fibers presented Lewis basic character
with a Kb/Ka ratio between 1.27 and 4.00, corresponding to curaua and pita Mexicana, respectively. Based
on the obtained linear adsorption isotherms, the surface area and monolayer capacity were higher for
piassava. Pita Mexicana appeared to be the most heterogeneous one, with two energetic sites. The alkaline
treatment of sisal increased the number of active sites for specific interactions, significantly increasing its
basic character. It also increased its surface area, with a consequent decrease in the diffusion coefficient.
Descrição
Palavras-chave
Vegetable fibers Inverse gas chromatography Surface properties Alkaline treatment . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Cordeiro, N., Gouveia, C., Moraes, A. G. O., & Amico, S. C. (2011). Natural fibers characterization by inverse gas chromatography. Carbohydrate Polymers, 84(1), 110-117.
Editora
Elsevier