Abstract
We propose a novel method for evaluation of the volume fraction, v, of solvent molecules in a specified region of a cellulose solid through dynamic viscoelasticity under the coexistence of solvents. The well-characterized two cuprammonium regenerated cellulose fibers were used. They were composed of primary particles with ca. 15 nm in size. A series of n-alcohols, poly(ethylene glycol)s, and poly(propylene glycol)s and glycerin were used as a hydrophilic molecules with OH groups. The dynamic storage modulus gave information on the state of the region where molecules could diffuse and peak temperature, Tfc, of the mechanical loss tangent gave v by putting Tfc into the semi-empirical equation. The results were as follows: (1) Tfc of βa absorption due to the local twisting motion of a main chain shifted to lower temperature by water and/or methanol and to higher temperature for other solvents. (2) v in the region related to the αsh absorption, originating from the segmental micro-brownian motion of the main chains located at the interface of the primary particle, showed a constant value for n-alcohols having less than eight carbon atoms per molecule. (3) v in the region related to αa absorption, originating from the segmental micro-brownian motion of the main chain in the primary particle, increased when molecular weight per one OH group for the solvent decreased and/or the peak temperature of αa was low.
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Manabe, Si., Fujioka, R. Method for Evaluation of Concentration of Solvent Molecules in a Specified Region of Regenerated Cellulose Solid. Polym J 30, 939–945 (1998). https://doi.org/10.1295/polymj.30.939
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DOI: https://doi.org/10.1295/polymj.30.939