Influence of Cold-drawing and Annealing on α-, βt-, and γ-Dispersions on Nylon 6 Fiber

Abstract

The influence of cold-drawing and annealing on α-, β-, and γ-dispersions of Nylon 6 fiber has been investigated. Differences in superstructures among 15 kinds of Nylon 6 fibers which were prepared by various combinations of cold-drawing and annealing exerted influence in a complex manner on the features, the absorption temperatures, and the apparent activation energies of these dispersions. The behaviors of the dispersions were discussed in terms of the previously reported information about the superstructures and the physical and mechanical properties of the fibers which were obtained by the same procedure as this study. The results are summarized as follows.
( 1 ) The peak te mperatrue and the apparent activation energy were most sensitively affected by the history of the fibers in the case of the α-dispersion, and the effect of the history became smaller for β- and γ-dispersions in an ascending order. As the motional units of segments related to a dispersion get larger, the dispersion appears to become more sensitive to the variation of the superstructure.
( 2 ) The intensities of the β-dispersion peak increased by cold-drawing and decreased by annealing. The results can be understood by the assignment that the β-dispersion is due to the movement of the amide groups free from intermolecular hydrogen-bonding.
( 3 ) The intensity of the γ-dispersion peak was dependent strongly on the orientation of molecular chains.