聚对苯二甲酸丁二酯(PBT)与在PBT中添加了热塑性聚酰胺系弹性体(TPAE)的PBT合金相比,前者的抗冲击强度低,后者的抗冲击强度高,通过偏光显微镜和扫描电镜的观察,在U型缺口前部区域内的塑性束缚下,PBT呈脆性破坏;PBT的合金因塑性区域内的空穴化和空穴的变形及空穴之间区域的颈缩和纤维化,有效的吸收了冲击能量,使塑性束缚得到缓解,促进了平面应变状态向平面应力状态转变,最终呈半韧性或韧性破坏.
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