高韧高强聚酮/聚酰胺66共混物的制备与性能研究

采用熔融共混法制备了聚酮（PK）/聚酰胺66（PA66）共混物，通过扫描电子显微镜、差示扫描量热仪、冲击试验机和电子万能试验机等研究了PK/PA66共混物的形态结构、结晶与力学性能。结果表明，当PA66含量较低时，PA66分散相粒径较小，且分布较均匀，PK/PA66（质量比为80/20）共混物的干态冲击强度达到29.5 kJ/m2，湿态下冲击强度为纯PK的4倍，同时共混物拉伸强度及弯曲模量也明显提高；但当PA66含量较高时，PA66相区尺寸明显增大，PK/PA66共混物的冲击强度呈下降的趋势；PA66的引入会显著降低PK的结晶度。

Preparation and Properties of High-toughness and High-strength Polyketone/Polyamide 66 Blends

The polyketone (PK)/PA66 blends were prepared by a melting extrusion method and their morphology, crystallization behaviors and mechanical properties were investigated by scanning electron microscopy, differential scanning calorimeter and mechanical performance measurements. The results indicated that the PA66 domain dispersed in the matrix exhibited a small particle size and uniform distribution at a low content. The impact strength of the blends is 29.5 kJ/m2 at the PK/PA66 weight ratio of 80/20 in a dry state but 4 times as much as that of pure PK in the wet state. Moreover, the strength and modulus of the blends were also improved significantly. However, when the PA66 content was relatively high, the domain size of PA66 phase increased remarkably, followed by a decrease in impact strength. The introduction of PA66 reduced the crystallinity of PK significantly.