AbstractThe hydrolysis of polyarylate in water between 55 and 98°C was found to be a zero‐order process with an activation energy of 19.2 kcal/mol, determined by changes in molecular weight. The equation for the effect of temperature on the rate of hydrolysis is lnk= 34.1 − 104/T, wherekis in day−1. The decrease in molecular weight is accompanied by a loss in ductility. The transition from a ductile to brittle failure in tension occurs at M̄wof about 35,000 and M̄nof 12,700. At 27°C (80°F) and high humidity environment this would occur after 21 years. But during injection molding, the material, if not properly dried, would embrittle in a matter
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