利用广角 X射线衍射 (WAXD)方法和示差扫描量热法 (DSC)研究了不同热处理温度时聚芳醚腈 (PCE)的微晶尺寸、结晶度及热性能的变化。结果表明 ,淬火样品在熔融温度以下 ,不同的热处理对微晶尺寸、结晶度、Tg 及 Tm都有不同程度的影响 ,但都随 Th 的升高 ,其 Dhkl、Xc和 Tm 也升高。实验同时还发现 ,结晶样品与原粉试样的结晶度比较均下降 ,说明 PCE聚合物在熔融过程中出现了交联现象 ,因而降低了结晶度 The changes of crystallite size, crystallinity and thermal properties of poly (aryl ether nitrile) (PCE) were investigated by WAXD and DSC. The results show that the quenched samples below the melting temperature, different heat treatment on the crystallite size, crystallinity, Tg and Tm have varying degrees of impact, but with the increase of Th, Dhkl, Xc and Tm also increased. The experiment also found that the crystallinity of the crystalline sample and the original sample were decreased, indicating that the crosslinking of the PCE polymer during the melting process, thus reducing the degree of crystallinity