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Cellulose

, Volume 11, Issue 1, pp 45–52 | Cite as

Carbon-13 NMR evidence for cocrystallization of cellulose as a mechanism for hornification of bleached kraft pulp

  • Roger H. Newman
Article

Abstract

Solid-state 13C NMR spectroscopy was used to characterize a bleached softwood kraft pulp in the never-dried state and after cycles of drying and remoistening. Changes in NMR signal strengths indicated that growth of crystalline domains involved cocrystallization rather than accretion of cellulose from noncrystalline domains. A cluster of C-4 signals at 89.4 ppm, assigned to the interiors of crystalline domains, grew at the expense of C-4 signals at 84.0 and 84.9 ppm, assigned to the well-ordered surfaces of crystalline domains. Irreversible changes were not detected until the moisture content dropped below 18%. They were enhanced by a second drying/remoistening cycle, but showed little further change on subsequent cycles. The necessary conditions resembled those reported for hornification, suggesting that cocrystallization might provide a mechanism for hornification.

Cocrystallization Crystalline domains Hornification Kraft pulp Solid-state NMR 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Roger H. Newman
    • 1
  1. 1.Industrial Research LimitedLower HuttNew Zealand

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