Spinnability and antistatic properties of poly(ethylene terephthalate) fibers blended with poly(ethylene oxide) and sodium dodecylbenzenesulfonate.

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Abstract
Poly(ethylene terephthalare) (PET) fibers blended with poly (ethylene oxide) (PEO) and sodium dodecylbenzenesulfonate (DSAS) were prepared by melt spinning at 280°C in order to make an antistatic modification of polyester fiber. The blend fibers as-spun were drawn by five times at 80°C and heat-treated at 140°C. Three PEO samples with molecular weight (Mn) of 4, 000, 10, 000, and 20, 000 were used. At a constant blend ratios of DSAS to PEO, both spinnability and drawability of the blend fibers were improved by increasing molecular weight of PEO. The fiber blended with 1.5wt% of PEO (Mn=20, 000) and 1.0wt% of DSAS had the optimum quality that was comparable to the control PET fiber. The antistatic property of these fibers was evaluated by half-life-time (t1/2) of leakage of electrostatic charge at 20°C and 45% RH. The values of t1/2 for the fibers before and after washing were in the range of 0.5-9.4sec and 3.4-11.5sec, respectively. Both values were much lower than those for the control PET fiber and the blend PET fibers containing PEO only. The higher the molecular weight of PEO, the higher the antistatic property of the blend fibers. The best property was attained with the fibers blended with 1.5wt% of PEO (Mn=20, 000) and 1.0wt% of DSAS. The tensile strength of the blend fibers was a little lower than that of the control PET fiber while the elongation became a little larger. The blend fibers had a Young's modulus higher than the PET fiber. From these results, the role of ionic surfactant DSAS is discussed in relation to the phase separation of PEO in the fiber matrix.

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