Abstract
Carbon-13 NMR methods were used to monitor changes in the proportions of crystalline and non-crystalline cellulose, and the exposure of chains on crystallite surfaces, in samples of alkali-treated kraft pulp and regenerated cellulose. A large increase in the amount of disorderd cellulose, as a result of conversion to cellulose II, is the major effect of alkali treatment with kraft pulp. Removal of small crystallites is the major effect with regenerated cellulose. Samples were examined never-dried, or were vacuum-dried prior to remoistening for characterization. Changes in molecular ordering consistent with pore collapse and coalescence of crystallite surfaces accompanied the removal of water.
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Hemmingson, J.A., Newman, R.H. Changes in molecular ordering associated with alkali treatment and vacuum drying of cellulose. Cellulose 2, 71–82 (1995). https://doi.org/10.1007/BF00812773
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DOI: https://doi.org/10.1007/BF00812773