Abstract
An attempt was made to clarify the supermolecular structure of regenerated celluloses recovered from the copper-absorbing celluloses, which were prepared by treating solid cellulose with aqueous (aq) cuprammonium hydroxide (CAH) solutions having different hydroxyl ion content (COH). X-Ray diffraction and CP/MAS 13C NMR analyses carried out on the regenerated cellulose samples revealed that the samples had a wide variation of supermolecular structures depending on the COH: (1) The CAH solutions with COH<0.174 mol l−1 brought about the increase in crystallinity, crystalline size and intramolecular hydrogen bond formation, and (2) the CAH solutions with COH>0.479 mol l−1 tend to give the reverse results. Circular dichroism (CD) spectra for the cellulose films treated by two kinds cuprammonium solutions with COH<0.174 and COH>0.479 revealed that cuprammonium ions orderly coordinate to C2 and C3 hydroxyl groups of glucopyranose units of cellulose in only amorphous region in the case of COH<0.174 and the CAH with COH>0.479 penetrates into even a part of crystalline region of cellulose and causes a ligand exchange from ammonia to hydroxyl groups to give a non-dissociated complex form of cellulose having certain random cross-linking by copper atom. Thus, we concluded that the difference in the complex form of the copper-absorbing cellulose influences considerably the super-molecular structure of the regenerated celluloses.
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Miyamoto, I., Matsuoka, Y., Matsui, T. et al. Studies on Structure of Cuprammonium Cellulose III. Structure of Regenerated Cellulose Treated by Cuprammonium Solution. Polym J 28, 276–281 (1996). https://doi.org/10.1295/polymj.28.276
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DOI: https://doi.org/10.1295/polymj.28.276