In this article, we demonstrate fabricating polypropylene (PP)/multiwalled carbon nanotube (MWCNT) nanocomposite fiber veils and use them as interleaves in single-polymer composites (SPCs) to enhance their thermal and mechanical properties. With this regard, we produced a hierarchical composite structure made of a film, a woven fabric and a fine fiber mat made of the same polymer. The nanocomposite fiber mats were generated by melt-blowing. Results implied that incorporating MWCNT increased the viscosity of the melt blowing grade PP resin. Increasing MWCNT content increased the average fiber diameter and pore size by 2.1-fold and 2.5-fold, respectively. Incorporating MWCNT enhanced the melt-blown (MB) fiber mat's specific strength by 78% and improved the thermal stability. We generated multiscale SPCs by film-stacking, for which we applied a PP film as a matrix, a PP-woven fabric as the primary reinforcement, and the MB fiber mats as interleaves. The SPC's tensile modulus was improved by 37% by the interleaving. Our findings implied that the MWCNT-doped PP fiber mat interleaving provides a robust interfacial adhesion and higher damage tolerance under tensile load. Master curves were constructed from dynamic mechanical analysis frequency sweep tests based on the time–temperature superposition principle. The storage modulus increased by 33%, while the tanδ decreased around 10% with PP/MWCNT fiber mat interleaving. The developed multiscale SPC with MWCNT fiber mat interleaving veils may be easily integrated into engineering composite applications due to its cost-efficiency, fair recycling, straightforward processing, enhanced stiffness, and interfacial adhesion.

中文翻译：

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与掺杂多壁碳纳米管的熔喷细纤维垫交错的单聚丙烯复合材料的开发

在本文中，我们展示了制造聚丙烯 (PP)/多壁碳纳米管 (MWCNT) 纳米复合纤维面纱，并将其用作单聚合物复合材料 (SPC) 中的交错层，以增强其热性能和机械性能。在这方面，我们生产了由薄膜、机织织物和由相同聚合物制成的细纤维垫制成的分层复合结构。通过熔喷产生纳米复合纤维垫。结果表明，加入 MWCNT 增加了熔喷级 PP 树脂的粘度。增加 MWCNT 含量使平均纤维直径和孔径分别增加了 2.1 倍和 2.5 倍。加入 MWCNT 可将熔喷 (MB) 纤维毡的比强度提高 78%，并提高热稳定性。我们通过薄膜堆叠生成多尺度 SPC，为此，我们使用了 PP 薄膜作为基体，PP 机织物作为主要增强材料，MB 纤维垫作为交织材料。SPC的拉伸模量通过交错提高了37%。我们的研究结果表明，MWCNT 掺杂的 PP 纤维垫交错提供了强大的界面粘合力和更高的拉伸载荷下的损伤容限。主曲线由基于时间-温度叠加原理的动态力学分析频率扫描测试构建。PP/MWCNT纤维毡交织后储能模量增加了33%，而tanδ降低了约10%。开发的多尺度 SPC 与 MWCNT 纤维垫交织面纱由于其成本效益、公平回收、直接加工、增强的刚度、