Print version ISSN 0104-1428
ALBINANTE, Sandra R.; PACHECO, Elen B. A. V.; VISCONTE, Leila L. Y. and TAVARES, Maria I. B.. Characterization of banana and coconut fibers by high-resolution nuclear magnetic resonance in the solid state. Polímeros [online]. 2012, vol.22, n.5, pp. 460-466. Epub Oct 11, 2012. ISSN 0104-1428. http://dx.doi.org/10.1590/S0104-14282012005000057.
High-resolution nuclear magnetic resonance analysis, NMR, in the solid-state permitted a detailed molecular dynamic study of natural fibers, including two obtained from the banana tree stems and from coconut fruits. The nuclear relaxation technique was applied to evaluate the domains associated with different mobilities of the fiber components, such as cellulose, hemicellulose and lignin. Experiments were also done to quantify the lignin content using a chemical method. From the relaxation times and the domain curves, fibers with higher lignin content were found to have higher relaxation times, because they present a more rigid structure with aromatic groups.
Keywords : Solid state NMR; nuclear relaxation; natural fibers.