An improved X-ray diffraction method for cellulose crystallinity measurement
2015; Elsevier BV; Volume: 123; Linguagem: Inglês
10.1016/j.carbpol.2014.12.071
ISSN1879-1344
AutoresXiaohui Ju, Mark Bowden, Elvie E. Brown, Xiao Zhang,
Tópico(s)Lignin and Wood Chemistry
ResumoWe show in this work a modified X-ray diffraction method to determine cellulose crystallinity index (CrI). Nanocrystalline cellulose (NCC) derived from bleached wood pulp was used as a model substrate. Rietveld refinement was applied with consideration of March-Dollase preferred orientation at the (0 0 1) plane. In contrast to most previous methods, three distinct amorphous peaks identified from new model samples which used to calculate CrI. A 2 theta range from 10° to 75° was found to be more suitable to determine CrI and crystallite structural parameters such as d-spacing and crystallite size. This method enables a more reliable measurement of CrI of cellulose and may be applicable to other types of cellulose polymorphs.
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