聚苯硫醚(PPS)/聚醚醚酮(PEEK)共混体系中PEEK的多熔融行为

MULTIPLE MELTING BEHAVIOR OF PEEK IN CRYSTAL/CRYSTAL BLENDS OF POLYPHENYLENE SULFIDE(PPS) AND POLYETHER ETHER KETONE(PEEK)

用ＤＳＣ研究了熔融时间（ｔｍｅｌｔ）和退火结晶时间（ｔａ）以及聚苯硫醚（ＰＰＳ）对聚醚醚酮（ＰＥＥＫ）多熔融行为的影响。ＰＰＳ加入使ＰＥＥＫ熔融多峰移向高温，易于形成熔融３峰。随ｔａ延长及ＰＰＳ含量增加，低温峰移向高温，高温峰移向低温，而在中间峰温区形成单一高而尖的熔融峰。在接近ＰＥＥＫ熔点温度退火时，发现共混物中ＰＥＥＫ的熔点比纯ＰＥＥＫ的高。

The effect of melting time (tmelt) and annealing crystallization time (ta) and the blending of polyphenylene sulfide (PPS) on the multiple melting behavior of polyether ether ketone (PEEK) have been investigated by differential scanning calorimetry (DSC). As the tmelt is increased, the melting peak shifts to lower temperature. The lower melting peak temperature (Tm1) increases as the ta is increased. The effect of the ta on the upper melting peak temperature (Tm2) depends upon the tmelt. Triple melting peak of PEEK could be observed. The formation of the triple melting peak is easy for PPS/PEEK blends. However, as the ta and the PPS content are increased, only one melting peak could be observed when the PPS/PEEK blends were annealed at 275 ℃ faor 12 h. The melting points of PEEK in its blends annealed at a temperature closer to the melting point of PEEK are higher than that of neat PEEK.