EFFECT OF BLENDING ON THE MULTIPLE MELTING BEHAVIOR OF POLYPHENYLENE SULFIDE

The effects of melting time (t(melt)) and annealing time (t(a)) at a t emperature closer to the melting point of polyphenylene sulfide (PPS) on the multiple melting behavior of neat PPS, and PPS component in the ir blends have been investigated by differential scanning calorimetry (DSC). it is found that double endotherm peak of PPS annealed at 275 d egrees C for less than three hours is different from that annealed for twelve hours. Double endotherm peak of PPS in PEEK/PPS blends shifts to lower temperature, and the intensity of the upper melting peak decr eases significantly by addition of polyether ether ketone (PEEK). An a dditional third melting peak could be observed. The temperature of thi rd melting peak is above 310 degrees C and increases as the t(a) and P EEK content are increased. For PEK-C/PPS blends, the lower and upper m elting temperatures of the PPS component are higher than that of neat PPS annealed at 275 degrees C for twenty-three hours. (C) 1996 John Wi ley & Sons, Inc.