Abstract
An attempt was made to disclose super-molecular structure and mechanical properties of new cellulose filament prepared from cellulose-aqueous alkali solution system. X-Ray crystallinity index χc(X) of the new cellulose filament was far higher than those of other commercial rayons, such as viscose including polynosic and cupro and was slightly lower than the organic spun rayon. The new cellulose filament showed the lowest degree of crystal orientation among these three kinds of cellulose fibers, because of its lowest draft and stretching ratio during the spinning process. In the new filament degree of the intramolecular hydrogen bondings (1−χam(C3)) estimated by 13C NMR method was highly developed. The mechanical loss tangent (tanδ) vs. temperature T curves of the new filament exhibited α relaxation (from higher temperature side; α2, αsh) attributed to micro-Brownian motion of the cellulose chains, two β (βa1, βa2), local mode of the chains, and γ, rotational mode of primary alcohol group at C6 position of pyranose rings, in the regions of T=250–100°C and −30∼−100°C, and near −100°C, respectively. Judging from the co relationships of these relaxation peak temperature Tmax to χc(X) and 1−χam(C3), we concluded that there exist two amorphous regions with well-developed intramolecular hydrogen bonds but less advanced intermolecular hydrogen bonds and vice-versa in the new filament. The results of thermally stimulated currency (TSC) measurements suggested that the hydrophobic interaction among cellulose chains is tightly formed in the region with the well-developed intramolecular hydrogen bonds. In this regard, χTSC peak named here was found to correspond to mechanical relaxation αsh. The tensile strength and elongation of the new filament were comparable to those of the regular viscose rayon. The new filament showed less swelling ratio and low fibrillation nature in water. Woven fabrics made from the filament gave some softness and high abrasion, compared with other commercial ones and were hard to wrinkle.
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Yamane, C., Mori, M., Saito, M. et al. Structures and Mechanical Properties of Cellulose Filament Spun from Cellulose/Aqueous NaOH Solution System. Polym J 28, 1039–1047 (1996). https://doi.org/10.1295/polymj.28.1039
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DOI: https://doi.org/10.1295/polymj.28.1039
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