<研究論文>セルロース繊維の分子鎖配向の経時変化

概要

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We intended to evaluate quantitatively a change in chain orientation along a fiber axis in an amorphous region of a regenerated cellulose fiber with time elapsed. Cuprammonium regenerated hollow fibers whose fine structure was represented by the aggregates of spherical primary particles of ca. 15nm in size. These fibers were stored in various conditions such as changing relative humidity, immersing solvents, and equilibrium solvent vapor pressure under free tension at room temperature. Birefringence at the center of a fiber Δn_<(c)> was measured in various solvents through the Bereck's compensator method. Refractive indexes n_<∥> and n_⊥ were measured in the mixed solvent through the Becke's line method, and the birefringence Δn_<(s)> and the mean refractive index n_<iso> at the interfacial surface of a fiber were calculated. In the case of hydrophobic environmental stored conditions, the degree of the chain orientation increased with increasing elapsed time. On the other hand, under the store conditions of hydorophilic environmental, the value was held constant or decreased. The increase of chain orientation may come from that of the orientation of the extended chain molecules bonding each primary particles.
福岡女子大学の論文
2002-03-20