TENSILE YIELD IN PHENOLPHTHALEIN POLYETHER KETONE

Uniaxial tension tests to the yield point were performed on phenolphth alein polyether ketone (PEK-C) from room temperature to near the glass transition temperature (T-g) at a constant rate of 0.02 min(-1). At r oom temperature, some measurements were also made at strain rates from 0.002 min(-1) to 2 min(-1). Yield stress was a linear function of tem perature and log strain rate. The temperature and the strain rate depe ndence of yield stress could be modeled using Eyring theory. Yield ene rgy was found to be a linear function of temperature. Young's modulus, yield strain, elastic strain, and plastic strain all decreased with t emperature. (C) 1994 John Wiley and Sons, Inc.