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High speed spinnings of sheath/core=Poly (ethylene terephthalate)/Polyethylene (PET/PE) and PE/PET bicomponent fibers were carried out and the tensile behavior of the as-spun fibers was investigated. The structure development of the PET component in the bicomponent fiber was enhanced whereas that of the PE component was suppressed in comparison with respective single component spinnings. The analyzed birefringence for PET and PE components in bicomponent fibers did not change by reversing the sheath-core arrangement of the components. Accordingly the initial Young's modulus of both the sheath/core=PET/PE and PE/PET fibers were similar. On the other hand, the elongation at break and tenacity of the PE/PET fibers were larger than those of the PET/PE fibers. A three-dimensional model analysis of the bicomponent fiber conducted assuming transverse isotropy suggested that the generation of tensile or compressive radial stress could cause such behavior in tensile testing. The necking behavior of the low-speed spun bicomponent fibers was analyzed in detail. The natural draw ratio was found to be governed by the molecular orientation of the PET component. The necking behavior was slightly affected by the presence of the PE component in that the different sheath-core arrangement caused different types of influence.

Alloy Blend Composites. Tensile Behavior of Poly(ethylene terephthalate)/Polyethylene Bicomponent Fibers Prepared by High-Speed Melt Spinning.