Structure and mechanical properties of polyamide-6,6/poly(ethylene terephthalate) blends
Structure and mechanical properties of polyamide-6,6/poly(ethylene terephthalate) blends
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DOI：
10.1002/pen.20136
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发表时间：
2004-08
影响因子：
3.2
通讯作者：
A. Retolaza;J. Eguiazábal;J. Nazábal
中科院分区：
文献类型：
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作者：
A. Retolaza;J. Eguiazábal;J. Nazábal
聚酰胺-6,6 (PA)/聚对苯二甲酸乙二醇酯 (PET) 共混物是通过直接注塑成型在整个成分范围内获得的。除了两个结晶相之外，共混物还由纯非晶 PET 相和可能纯 PA 非晶相组成。尽管 PA 使 PET 结晶成核，但共混物中 PA 和 PET 的结晶度没有变化。形态异质性较低，因为虽然看到大颗粒，但它们大多包含许多小（通常为 0.3 μm）闭塞物。这种相当均匀的结构归因于熔融共混过程中观察到的反应。共混物的杨氏模量和屈服应力遵循混合物的规律，与共混物两种组分混合时结晶度、比容和取向没有变化的情况非常吻合。延展性值也非常接近混合物规则预测的值，10/90 混合物中的绝对协同作用表明相容性。这种积极的机械行为与之前的工作中观察到的形成鲜明对比，归因于 PET 的结晶方式、高度分散的形态以及本研究中获得的共混物的高度无定形特征。在 80°C 退火一天或 100°C 退火 30 分钟后，共混物的延展性表明这些高度分散和部分反应的共混物具有相当大的耐温性。聚合物。工程师。科学。 44:1405–1413, 2004。© 2004 塑料工程师协会。
Polyamide-6,6 (PA)/poly(ethylene terephthalate) (PET) blends were obtained by direct injection molding over the whole composition range. Besides the two crystalline phases, the blends were composed of a pure amorphous PET phase, and a probably pure PA amorphous phase. The crystallinity of PA and PET did not change in the blends, although PA nucleated the crystallization of PET. The morphological heterogeneity was low because, although large particles were seen, they mostly contained many small (typically 0.3 μm) occlusions. This fairly homogeneous structure is attributed to the reactions observed during melt blending. The Young's modulus and yield stress of the blends followed the rule of mixtures, in good agreement with the lack of change of the crystallinity content, specific volume and orientation of the two components of the blends when they are mixed. The ductility values were also very close to those predicted by the rule of mixtures, with an absolute synergism in the 10/90 blend indicating compatibility. This positive mechanical behavior contrasts with that observed in previous works, and is attributed to the way PET crystallizes, to the highly dispersed morphology, and to the highly amorphous character of the blends obtained in this study. The ductile nature of the blends after annealing at either 80°C for one day or 100°C for 30 min indicated the considerable temperature resistance of these highly dispersed and partially reacted blends. Polym. Eng. Sci. 44:1405–1413, 2004. © 2004 Society of Plastics Engineers.