Structure and Performance of High Dtex PET-PBT Blending Monofilaments

Poly(butylene terephthalate) (PBT) and poly(ethylene terephthalate) (PET) were blended in certain proportions to spin large diameter monofilaments. The effect of the blending ratio and postdrawing technology on the compatibility and tensile strength of the blending monofilaments were studied by mechanical properties testing, scanning electron microscopy and thermal property analysis. Results showed that the knot strength was raised by blending of PET-PBT. The liquid cooling temperature, the stretching ratio and the stretching temperature were the major factors, which influenced the mechanical properties of the blending monofilaments.