Phase behavior of pseudo‐IPN's of polycarbonate‐urethane and polystyrene

Abstract

The pseudo‐IPN's of PCU/PS with different M_n and narrow MWD of the linear PS have been synthesized and characterized. The effect of M_n and composition on the phase morphology of the pseudo‐IPN's of PCU/PS has been studied by DSC and SEM. The pseudo‐IPN's with ultra‐high M_n of the linear PS appeared to possess a single T_g and no SEM‐resolvable domains at 35 wt % PS and below. This metastable state may reflect the result of a high extent of entanglement of the linear PS chains with the PCU network and the limited molecular mobility of the linear PS chains with high M_n. © 1993 John Wiley & Sons, Inc.