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在系统观察分析PS、PC冲击断面基础上，总结了玻璃态无定形聚合物材料断面肋状特征，对肋状形态形成的机理进行了探讨，提出了肋状形态形成的充要条件．
Based on systematic observation and analysis of the PS and PC impact sections, the rib features of glassy amorphous polymer materials were summarized, and the formation mechanism of ribbed shapes was discussed. The necessary and sufficient conditions for the formation of ribbed shapes were proposed.