Abstract
Polyester/ether, poly (ethylene-1, 2-diphenoxyethane-p, p'dicarboxylate) (PEET), fibers have been drawn under several conditions. Birefringence of the fibers only depended on draw ratio and crystallinity of the fibers mainly depended on drawing temperature. On the same drawing ratio, crystallinity and lateral crystallite size increased but amorphous birefringence and axial crystallite size decreased with an increase in drawing temperature. On the same drawing temperature, birefringence increased but crystallinity and crystallite size were almost constant with an increase in the drawing ratio. Melting point of the fibers depended both on axial and lateral crystallite sizes. These results could be explained by that highly aligned molecules were laterally well ordered but translationally shifted along the chain, because of long monomeric unit length.Young's modulus of the fibers mainly depended on the birefringence but not on fiber morphology.
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