This work aims to investigate how adding functionalized carbon nanotubes (CNTs) to a Polyamide 6/polypropylene blend influences its properties. CNT functionalization was carried on through plasma with oxygen (CNT_O2) or maleic anhydride (CNT_MA). CNT_O2 presented the highest amount of oxygen, but, as the treatment time in plasma was twice as long as that of the CNT_MA sample, the oxygenated groups, for the most part, tended to formed lactones. On the other hand, plasma treatment with maleic anhydride was more efficient to insert carboxylic groups onto the CNT surface. Adding non-functionalized CNT in the blend, an elongation of PP phase was observed. In the functionalized CNT nanocomposites, a significant decrease in phase size was observed. No improvement in adhesion between phases was observed. Crystallinity degree decreased when non-functionalized CNT was added and increased with functionalized CNT. Despite the greater interaction between amorphous and crystalline regions observed in nanocomposites with CNT_O2, the highest values of storage module came from CNT_MA nanocomposite. The COOH groups on the CNT surface reacted with the polyamide, improving tension transfer between phases and leading to a better performance in blend mechanical properties.

中文翻译：

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马来酸酐和氧功能化碳纳米管对聚酰胺6和聚丙烯共混物性能的影响

这项工作旨在研究将官能化碳纳米管 (CNT) 添加到聚酰胺 6/聚丙烯混合物中如何影响其性能。CNT 功能化是通过等离子体与氧 (CNT_O2) 或马来酸酐 (CNT_MA) 进行的。CNT_O2 的氧气含量最高，但是，由于等离子体中的处理时间是 CNT_MA 样品的两倍，因此大部分含氧基团倾向于形成内酯。另一方面，用马来酸酐进行等离子体处理更有效地将羧基插入到 CNT 表面。在共混物中加入非官能化的 CNT，观察到 PP 相的伸长。在功能化的 CNT 纳米复合材料中，观察到相尺寸的显着减小。没有观察到相间粘附力的改善。添加非功能化碳纳米管时结晶度降低，添加功能化碳纳米管时结晶度增加。尽管在具有 CNT_O2 的纳米复合材料中观察到的非晶和结晶区域之间的相互作用更大，但存储模块的最高值来自 CNT_MA 纳米复合材料。碳纳米管表面的 COOH 基团与聚酰胺反应，改善了相间的张力传递，并导致更好的共混机械性能。