Abstract
CP/MASS 13C NMR spectra of wood pulp with the crystal form of cellulose I (referred to as cellulose I), cellulose regenerated from mercerized wood pulp with crystal form of cellulose II (cellulose II), and cellulose powder ground in ball mill were investigated. The spectrum of ball milled cellulose powder had broad carbon peaks at almost the same positions as those in solution, suggesting that there is no strong intramolecular hydrogen bonds of specific bond length. For cellulose I and II, one or two sharp components, in addition to broad component, were observed for each carbon and the former component was assigned to a strong intramolecular hydrogen bond. Among three possible intramolecular hydrogen bonds, O3–H···O5′, O2–H···O6′, and O6–H···O2′, simultaneous hydrogen bonds of the former two can explain consistently all the peaks of the NMR spectrum of cellulose I experimentally observed. To explain the NMR spectrum of cellulose II, the three intramolecular hydrogen bonds are necessary.
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Kamide, K., Okajima, K., Kowsaka, K. et al. CP/MASS 13C NMR Spectra of Cellulose Solids: An Explanation by the Intramolecular Hydrogen Bond Concept. Polym J 17, 701–706 (1985). https://doi.org/10.1295/polymj.17.701
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DOI: https://doi.org/10.1295/polymj.17.701
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