We show in this work a modified X-ray diffraction method to determine cellulose crystallinity index (CrI). Nanocrystalline cellulose (NCC) dervided from bleached wood pulp was used as a model substrate. Rietveld refinement was applied with consideration of March-Dollase preferred orientation at the (001) plane. In contrast to most previous methods, three distinct amorphous peaks identified from new model samples which are 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.
Revised: February 27, 2020 |
Published: January 13, 2015
Citation
Ju X., M.E. Bowden, E.E. Brown, and X. Zhang. 2015.An Improved X-ray Diffraction Method For Cellulose Crystallinity Measurement.Carbohydrate Polymers 123.PNNL-SA-108288.doi:10.1016/j.carbpol.2014.12.071