SYNOPSISPoly(ethylene-2,6-naphthalenedicarboxylate)(PEN) has been prepared from commercial dimethyl-2,6-naphthalenedicarboxylate (DM-2,6-NDC) and ethylene glycol (EG) according to the well-known transesterification/polycondensation route. P E N fibers, intended for industrial yarn applications, were obtained by melt spinning and drawing high molecular weight PEN. The properties of these yarns were measured in detail and compared with those of P E T industrial yarns. The development of molecular orientation in the spinline is more pronounced for PEN than for PET. Because the yield stress is lower, P E N yarns can more easily be drawn. Breaking tenacities of PEN yarns are comparable with those of P E T yarns, but the modulus is much higher and the thermal shrinkage is lower. Therefore, P E N yarns have a better dimensional stability than PET yarns. In addition, it was demonstrated that the thermal resistance of P E N yarns is better. 0 1995 John Wiley & Sons, Inc.

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