对聚苯硫醚(PPS)工程塑料的冲击断口形貌进行了宏观和微观观察，总结了PPS冲击断口的典型形貌特征，并研究了各典型形貌随试验温度的变化规律。宏观断口分析表明：当t＜60℃时，断口由平坦区、放射区和最后断裂区组成;当 t≥60℃时，断口非常平坦，除少量人字形放射条纹外几乎观察不到其他形貌特征。微观断口分析和定量测试表明：平坦区微观典型形貌为岩石层状，随温度的升高，岩石层的片层尺寸和粗糙度都越来越大。在-196℃≤t≤-60℃时，放射区的放射状条纹数量较多且细密，当-60℃＜t≤20℃时，放射状条纹数量逐渐减少，放射状片层粗糙不平，呈细密的岩石状形貌。最后断裂区可观察到弧形条纹(裂纹中止线)和河流花样。t＜60℃时PPS发生脆性断裂，随温度升高，平坦区面积增大，缺口冲击强度线性增高。

The fractographic features of notched impact PPS specimens at different impact temperature had been studied systematically both by the macroscopic and microscopic observation. The typical morphology and its changing regularity with the impact temperature had been concluded. The macroscopic study showed that,when the impact temperature is lower than 60℃,the fracture surface can be divided into the flat zone,the radiation zone and the last fracture zone. When the impact temperature is higher than 60℃,the fracture surface is rather flat,and nothing could be observed except for several radiation stripes. The microscopic study and the quantitative measurement showed that,the typical morphology of flat zone is rocky pattern. The size and roughness of rocky pattern grow with the increase of temperature. When the temperature is in the range of -196℃ to -60℃,there are lots of thin radiation stripes,and when the temperature is in the range of -60℃＜t≤20℃,the radiation stripes decreased gradually. Arc pattern and river pattern could be found in the last fracture zone. When the temperature is lower than 60℃,the notched impact strength grows lineally with the increase of flat zone size.