Using ultra-thin interlaminar carbon nanotube sheets to enhance the mechanical and electrical properties of carbon fiber reinforced polymer composites
Using ultra-thin interlaminar carbon nanotube sheets to enhance the mechanical and electrical properties of carbon fiber reinforced polymer composites
复制标题
DOI：
10.1016/j.compositesb.2021.108842
复制
发表时间：
2021-04-05
影响因子：
13.1
通讯作者：
Tehrani, Mehran
中科院分区：
文献类型：
--
作者：
Koirala, Pratik;van de Werken, Nekoda;Tehrani, Mehran
碳纤维增强聚合物复合材料（CFRP）的一个主要缺点是层间性能差。这项研究提供了一种廉价且易于扩展的解决方案，通过在cfrp层（层压板）之间结合超薄碳纳米管（CNT）来解决这个问题。为此，首先将干燥的碳纤维织物夹在碳纳米管薄片之间。然后将织物堆叠并注入环氧树脂，形成具有层间碳纳米管片的CFRP。与将微米长的碳纳米管随机分布在CFRP中进行加固的典型方法相反，本研究使用类似于100 nm厚的碳纳米管片，由排列整齐的超长（0.3 mm）碳纳米管组成。尽管碳纳米管的重量分数仅为0.016%，但层间碳纳米管的抗弯强度提高了49%，层间抗剪强度提高了30%，I型断裂韧性提高了30%。x射线显微断层扫描显示，层间CNTs的样品具有明显的抗分层和抗裂纹扩展能力。此外，这些复合材料的面内电导率随着碳纳米管的重量分数的增加而增加，与0.048 wt%的碳纳米管片相比，复合材料的面内电导率最大提高了278%。研究表明，在重量和厚度几乎不变的情况下，层间碳纳米管可以提高cfrp的导电性和层间性能。
A major shortcoming of carbon fiber reinforced polymer composites (CFRP) is their interlaminar performance. This study provides an inexpensive and readily scalable solution to this problem by incorporating ultra-thin sheets of carbon nanotubes (CNT) between the plies (laminates) of CFRPs. To this end, dry carbon fiber fabrics are first sandwiched between CNT sheets. The fabrics are then stacked and infused with epoxy to form a CFRP with interlaminar CNT sheets. Contrary to the typical approach where microns-long CNTs are distributed randomly within a CFRP for reinforcement, this study uses similar to 100 nm thick CNT sheets consisting of aligned and ultra-long (0.3 mm) nanotubes. Despite their negligible weight fraction of only 0.016%, the interlaminar CNT sheets enhanced the CFRP's flexural strength by 49%, interlaminar shear strength by 30%, and mode I fracture toughness by 30%. X-ray micro-tomography revealed that samples with interlaminar CNTs are significantly resistant to delamination and crack propagation. Moreover, the in-plane electrical conductivity of these composites increased commensurate with the weight fraction of CNTs, providing a maximum enhancement of 278% over the reference sample for 0.048 wt% of CNT sheets. This study reveals that for almost no change in weight and thickness, interlaminar CNT sheets can enhance the electrical conductivity and interlaminar performance of CFRPs.