STABILIZING MELT CRYSTALLIZATION TEMPERATURE IN ARYLENE SULFIDE POLYMER HEAT TREATMENT

摘要

A method for stabilizing the Tmc of PPS subjected to heat treatment in a temperature range between 240 DEG C. and 320 DEG C., particularly during the heating process of an extrusion operation, by increasing the tmperature of the polymer through the 240 DEG C.-320 DEG C. range at a rate of at least 20 DEG C. per minute or by subsequently raising the temperature of the polymer to at least 350 DEG C. for a time sufficient to stabilize the Tmc of the polymer.