Comparison and Characterization of Polyester Fiber and Microfiber Structure by X-ray Diffractometry and Viscoelasticimetry

摘要

The authors have studied three polyethylene terephthalate filaments from the same manufacturer. The results of the dyeing process depend on the filaments' characteristics. Dyeing modifies the macromolecular organization according to the manufacturing process. To understand the dyeing influence, each filament is subjected to a heat treatment that reproduces the effect of dyeing. The organizational molecular modifications are determined by x-ray diffraction and viscoelasticimeter measurements. The study shows that drawing and shearing align macromolecules, affecting the cry stallinity. The crystallinity of a trilobal filament and of a microfilament are almost identical whatever the heat treatment. The less significant drawing of a circular filament provides a more amorphous and more sensitive filaments for heat treatment. Super-drawing induces the existence of macromolecular segments of a great mobility. Moreover, a heterogeneity of the organization is detected at the glass transition point