A carregar...
Publicação
Investigation of surface properties of physico-chemically modified natural fibres using inverse gas chromatography
| Nome: | Descrição: | Tamanho: | Formato: | |
|---|---|---|---|---|
| 788.29 KB | Adobe PDF |
Orientador(es)
Resumo(s)
Inverse gas chromatography (IGC) is a suitable method to determine surface energy of natural fibres
when compared to wetting techniques. In the present study, the surface properties of raw and modified
lignocellulosic fibres have been investigated by IGC. The fibres chosen for the study were flax, hemp, kenaf,
agave, agave hybrid, sisal and pineapple. The treatments used were 4% NaOH and 2% zein. The uniqueness
of zein treatment is that it is bio-based and therefore maintains the biodegradable character of the natural
fibres. Fourier transform infrared spectroscopy (FTIR) and environmental scanning electron microscope
(ESEM) were also performed to characterize the surface changes in fibres. The surface properties of
fibres are influenced by the chemical composition, crystallinity and morphology of the fibres. Bast fibres
exhibited higher surface dispersive energy than leaf fibres. The raw fibres have a predominant basic
character, whereas the alkaline treatment makes the fibres more acidic. Both alkaline and zein treatments
decrease the dispersive surface energy and the specific free energy of adsorption.
Descrição
Palavras-chave
Natural fibres Fibres modification Alkaline treatment Zein treatment Inverse gas chromatography Surface properties . Faculdade de Ciências Exatas e da Engenharia
Contexto Educativo
Citação
Cordeiro, N., Gouveia, C., & John, M. J. (2011). Investigation of surface properties of physico-chemically modified natural fibres using inverse gas chromatography. Industrial Crops and Products, 33(1), 108-115.
Editora
Elsevier