Title: Cellulose crystallinity of woods, wood pulps, and agricultural fibers by FT-Raman spectroscopy
Author: Agarwal, Umesh P.; Reiner, Richard R.; Ralph, Sally A.
Source: Proceedings, 16th international symposium on wood, fiber and pulping chemistry, 2011 June 8-10, Tianjin, China. Beijing, China : China Light Industry Press, 2011: p. 69-74.
Description: Recently, for estimating cellulose crystallinity, the authors had proposed univariate and multivariate FT-Raman methods. In the present investigation, the univariate method was applied to a number of additional biomaterials (softwoods, hardwoods, wood pulps, and agricultural fibers). The materials were studied in the native, partially-delignified, and alkaline hydrogen peroxide bleached states. The latter two states were examined to evaluate how Raman crystallinity measurement is influenced by the presence of lignin in the sample and by the existence of sample-fluorescence in the Raman spectrum. It was found that for most lignin containing materials the univariate Raman method was a suitable alternative to calculate cellulose crystallinity. Additionally, another univariate FT-Raman method based on Segal-WAXS (or 18-WAXS) was developed (18-univariate Raman) and compared to the one proposed previously (21-univariate Raman). Compared to 21-univariate Raman, the 18-univariate Raman method produced the crystallinities that were about 17% higher. Therefore, it is proposed that for estimating cellulose crystallinities in lignocellulosic materials 21-univariate Raman be used instead of 18- or Segal-WAXS method.
Keywords: Analytic chemistry, cellulose chemistry, wood chemistry, Fourier transform spectroscopy, Raman spectroscopy, spectrum analysis, regression analysis, correlation, multivariate analysis, crystallization, chemical composition, bleaching, hydrogen peroxide, lignin analysis, fluorescence, lignocellulose, x-rays, cellulose fibers, wood-pulp, lignin chemistry, crystallinity, univariate analysis, crystalline cellulose, WAXS method, delignification, wood fibers, FT-Raman
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Agarwal, Umesh P.; Reiner, Richard R.; Ralph, Sally A. 2011. Cellulose crystallinity of woods, wood pulps, and agricultural fibers by FT-Raman spectroscopy. In: Proceedings, 16th international symposium on wood, fiber and pulping chemistry, 2011 June 8-10, Tianjin, China. Beijing, China : China Light Industry Press, 2011: p. 69-74.
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