Impact fracture behavior of nylon-6/ABS blends
Impact fracture behavior of nylon-6/ABS blends
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DOI：
10.1002/(sici)1099-0488(19971130)35:16
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发表时间：
1997-11
期刊：
影响因子：
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通讯作者：
A. Mamat;T. Vu-khanh;P. Cigana;B. Favis
中科院分区：
文献类型：
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作者：
A. Mamat;T. Vu-khanh;P. Cigana;B. Favis
对整个组合物范围内不相容的尼龙 6/ABS 共混物的拉伸和冲击性能进行了研究。该共混物通过挤出制备，随后注塑成拉伸样品和矩形板。使用最近提出的基于断裂力学的模型针对各种断裂行为来表征冲击断裂性能。结果表明尼龙6以脆性方式断裂。添加 ABS 后，共混物表现出相同的行为，但抗冲击性稍低，最高可达约 60 wt%。在 70 wt% ABS 附近观察到冲击断裂能值突然跃升，断裂机制发生脆性-延性转变。断裂机制的转变通过扫描电子显微镜（SEM）观察断裂表面来证实。拉伸测试表明，ABS 含量为 0 至 50% 时，断裂伸长率仅略有增加，但 ABS 含量为 70% 时，断裂伸长率出现显着跳跃，与纯组分相比，断裂伸长率增加了 6 倍。蚀刻样品的 SEM 观察表明，70 wt% ABS 附近出现共连续形态。观察到的断裂伸长率峰值和冲击性能的跳跃，以及脆性转变的开始，都归因于这种形态效应。 © 1997 John Wiley & Sons, Inc. J Polym Sci B：Polym Phys 35：2583–2592，1997
Tensile and impact properties of uncompatibilized nylon-6/ABS blends have been studied over the entire range of compositions. The blends were prepared by extrusion and, subsequently, injection molded into tensile specimens and rectangular plaques. The impact fracture performance was characterized using recently proposed models based on fracture mechanics, for various fracture behaviors. The results showed that nylon-6 breaks in a brittle manner. With the addition of ABS, the blend exhibits the same behavior with a slightly lower impact resistance up to about 60 wt %. A sudden jump in the value of impact fracture energy is observed around 70 wt % ABS with a brittle—ductile transition in the mechanism of fracture. The transition in fracture mechanisms is confirmed through observation of the fracture surfaces by scanning electron microscopy (SEM). Tensile tests showed that the elongation at break increases only slightly between 0 and 50% ABS content, but a significant jump occurs around 70% ABS, reaching a 6-fold increase in comparison to that of the pure components. SEM observation of etched samples shows that a cocontinuous morphology occurs around 70 wt % ABS. The peak observed for the elongation at break and the jump in impact performance, as well as the onset of brittle–ductile transition, are attributed to this morphological effect. © 1997 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 35: 2583–2592, 1997