Effect of molecular mobility on the deformation characteristics of polycaproamide fibres

Abstract

The deformation characteristics of PCA fibres are a function of the deformation temperature to a significant degree. The character of the curves of E(e), Emax(t), σb(t), and eb(t) indicate a pronounced change in the mechanical properties of PCA fibres not only in “thawing” of segmental mobility in amorphous regions of the polymer, but also in passage of crystallites into the mesomorphic state, which is characterized by pronounced weakening of interchain interactions in the crystallites. The first segment of σ(e) is only observed in the curves for PCA fibres in the glassy state. In activation of segmental mobility, the σ(e) curves only contain the second and third segments.