Abstract
The relationship between the structure and the drawing behaviour of the rolled or compressed nylon 6.10 and 6 undrawn filaments were studied with the X-ray diffraction and photomicrography. Molecular chains are oriented perpendicular to the filament axis and hydrogen-bonded sheets became parallel to the rolled or compressed plane. The region with these special orientation is limited to the central part and the surrounding region shows the low c-axis orientation for the undrawn filaments rolled 50%. When these rolled or compressed specimens are extended above 100°C, two families of deformation bands crossed each other generate at these specially oriented regions and as the drawing temperature is raised above 170°C and the drawing is continued, the formation of deformation bands is immediately followed by the initiation of cracks on the deformation bands.
The condition of the crack initiation depends upon the temperature of drawing and that of annealing of the specimens before drawing. Cracks do not initiate along the deformation bands and the fracture is brittle-like for the specimens rolled 50%, annealed at 220°C and pre-drawn slightly at 190°C.
