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Solution properties of celluloses from different biological origins in LiCl · DMAc

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Abstract

Differences in the solution properties of cellulose in 8%LiCl · DMAc (dimethyl acetamide) were investigated usingcelluloses from different origins. The latter included plants (dissolving pulp(DP), cotton linters (CC), and kraft pulp), bacteria (Acetobacterxylinum, BC), and marine animals (tunicin fromHalocynthia). The celluloses from plants and bacteriaformed LiCl · DMAc solutions that were isotropic andanisotropic, respectively; and the animal cellulose was insoluble. The weightaverage molecular weights, Mw, of DP, CC and BC were found to be98.2 × 104,170 × 104 and192 × 104, respectively. The solutionviscositieswere proportional to cα (c; polymer concentration) in thedilute and semi-dilute regions, where the exponent α was 1 for allsamplesin the dilute region; in the semi-dilute region, it was 4 for the DP and CCsolutions and 3 for the BC solution. Molecular weight differences werecompensated by plotting the viscosity against cMw orc[η] (where [η] is the limiting viscosity number).The difference in viscosity behavior at elevated solutionconcentration indicates that the cellulose molecules from DP and CC behave asflexible polymer chains and those of BC as rod-like ones.These results suggest that differences in molecular structure andproperties exist between celluloses from different sources, and that thesedifferences relate to the mechanism or the type of the intermolecularinteraction between the celluloses of plants (DP and CC) and those of bacteria(BC).

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Matsumoto, T., Tatsumi, D., Tamai, N. et al. Solution properties of celluloses from different biological origins in LiCl · DMAc. Cellulose 8, 275–282 (2001). https://doi.org/10.1023/A:1015162027350

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