Abstract
All-cellulose composites were prepared by partly dissolving microcrystalline cellulose (MCC) in an 8.0 wt% LiCl/DMAc solution, then regenerating the dissolved portion. Wide-angle X-ray scattering (WAXS) and solid-state 13C NMR spectra were used to characterize molecular packing. The MCC was transformed to relatively slender crystallites of cellulose I in a matrix of paracrystalline and amorphous cellulose. Paracrystalline cellulose was distinguished from amorphous cellulose by a displaced and relatively narrow WAXS peak, by a 4 ppm displacement of the C-4 13C NMR peak, and by values of T2(H) closer to those for crystalline cellulose than disordered polysaccharides. Cellulose II was not formed in any of the composites studied. The ratio of cellulose to solvent was varied, with greatest consequent transformation observed for c < 15%, where c is the weight of cellulose expressed as % of the total weight of cellulose, LiCl and DMAc. The dissolution time was varied between 1 h and 48 h, with only small additional changes achieved by extension beyond 4 h.
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Abbreviations
- MCC:
-
Microcrystalline cellulose
- DMAc:
-
N,N-dimethylacetamide
- NMR:
-
nuclear magnetic resonance
- WAXS:
-
Wide-angle X-ray scattering
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Acknowledgments
The authors would like to thank the Biopolymer Network Limited (New Zealand) for financial assistance and technical support provided to this project. One of the authors (MPS) would like to thank the Brian Mason Scientific and Technical Trust for financial assistance. The authors thank Mr. S. Hill (Scion Limited, Rotorua, New Zealand) for assistance with solid-state NMR and Mr. S. Brown for acquisition of the WAXS patterns.
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Duchemin, B.JC.Z., Newman, R.H. & Staiger, M.P. Phase transformations in microcrystalline cellulose due to partial dissolution. Cellulose 14, 311–320 (2007). https://doi.org/10.1007/s10570-007-9121-4
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DOI: https://doi.org/10.1007/s10570-007-9121-4