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- Publisher
- de Gruyter
- Copyright
- Copyright © 2009 Walter de Gruyter
- ISSN
- 0018-3830
- eISSN
- 1437-434X
- DOI
- 10.1515/hfsg.1995.49.6.498
- Publisher site
- See Article on Publisher Site
Abstract
Introduction While a large number of methods have been employed to investigate the Crystallinity or accessibility of pure celluloses (Roberts 1991), very few are suitable for investigating the Crystallinity of celluloses in wood and pulp. To date, only X-ray diffraction (Stewart and Foster 1976; Ahtee et al 1983; loelovich et al. 1989) and solid state 13C NMR spectroscopy (Newman and Hemmingson 1990) have been used for cellulose Crystallinity determination in wood and pulps. Other methods are unsuitable due to interference from hemicelluloses and lignin. The changes in cellulose Crystallinity during kraft and other alkaline pulping processes have been investigated by several workers (Stewart and Foster 1976; Hattula 1986; Sashilov et al 1986; loelovich et al 1989; Newman et al 1993; Chan et al 1993). In all cases, the proportion of crystalline cellulose was higher in the pulp than in the starting wood, due to removal of the lignin and hemicelluloses during pulping. Stewart and Foster (1976) found, using X-ray diffraction, that there was a loss of 1.4 % (based on o. d. wood) of crystalline cellulose during kraft pulping of Eucalyptus regnans to kappa number 33. Kraft cooking to kappa number 8 led to a further reduction in
Journal
Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood – de Gruyter
Published: Jan 1, 1995