ABSTRACT Thermoplastic polyurethane (TPU) and carbon nanotubes (CNTs) were incorporated into polyamide 6 in an attempt to enhance notched impact resistance and damping performance. The morphology, mechanical, thermal and viscoelastic properties of different samples were studied. Scanning electron microscopy study indicated a uniform distribution of fine TPU droplets in PA6/TPU blend. Furthermore, well-dispersed CNTs in PA6/TPU matrix and good adhesion of polymer matrix to CNTs were observed. The addition of TPU into PA6 developed a rough fracture surface morphology and increased the notched impact strength equal to 39%, yet declined tensile and flexural resistance. The inclusion of CNTs into PA6/TPU improved mechanical properties comprising tensile, flexural and notched impact strengths as high as 14%, 12% and 16% respectively. The results of dynamic mechanical thermal analysis (DMTA) indicate: the addition of TPU into PA6 improves damping performance; the inclusion of carbon nanotubes in PA6/TPU enhances both energy storage and glass transition temperature.

中文翻译：

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PA6/TPU/CNT纳米复合材料的形貌、力学、热和粘弹性性能研究

摘要 将热塑性聚氨酯 (TPU) 和碳纳米管 (CNT) 结合到聚酰胺 6 中，试图提高缺口抗冲击性和阻尼性能。研究了不同样品的形貌、力学、热和粘弹性性能。扫描电子显微镜研究表明细小的 TPU 液滴在 PA6/TPU 混合物中分布均匀。此外，还观察到了在 PA6/TPU 基体中分散良好的 CNT 以及聚合物基体与 CNT 的良好附着力。在 PA6 中加入 TPU 产生了粗糙的断裂表面形态，增加了 39% 的缺口冲击强度，但降低了拉伸和弯曲阻力。将碳纳米管加入 PA6/TPU 可改善机械性能，包括分别高达 14%、12% 和 16% 的拉伸、弯曲和缺口冲击强度。动态机械热分析（DMTA）结果表明：在PA6中加入TPU提高了阻尼性能；PA6/TPU 中包含碳纳米管可提高能量存储和玻璃化转变温度。