Environmental degradation of carbon nanotube-modified composite laminates: a study of electrical resistivity
Environmental degradation of carbon nanotube-modified composite laminates: a study of electrical resistivity
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DOI：
10.1007/s11029-009-9059-8
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发表时间：
2009-01-01
影响因子：
1.7
通讯作者：
Kostopoulos, V.
中科院分区：
文献类型：
--
作者：
Barkoula, N. M.;Paipetis, A.;Kostopoulos, V.
研究了碳纳米管（CNT）改性碳纤维增强聚合物（CFRP）的环境耐久性。这些新一代复合材料的关键问题是用纳米填料对其聚合物基体进行改性。最近证明，这些材料的损伤容限，表现为它们的断裂韧性，冲击性能和疲劳寿命，可以通过添加碳纳米管的重量分数低至0.5%的改善。这种改进主要归因于CNT和基质之间的额外界面区域的并入，其在纳米级下是活性的。然而，这种额外的界面可能对上述系统的环境耐久性具有负面影响，因为众所周知，基质的吸湿能力通过多个界面的存在而增强，多个界面用作水的进入途径。为了研究这个问题，CNT改性CFRP暴露于水热负荷。在规定的时间间隔，对复合材料进行称重，并记录改良系统和参考系统的吸水量与时间的关系。在相同的时间间隔记录复合材料的电导率。环境暴露后，调节复合材料系统的层间剪切性能进行了测量，并与未改性的复合材料，以及与未暴露的层压板的剪切性能进行了比较。
The environmental durability of carbon nanotube (CNT)-modified carbon-fibre-reinforced polymers (CFRPs) is investigated. The key problem of these new-generation composites is the modification of their polymer matrix with nanoscaled fillers. It was recently demonstrated that the damage tolerance of these materials, as manifested by their fracture toughness, impact properties, and fatigue life, can be improved by adding CNTs at weight fractions as low as 0.5%. This improvement is mainly attributed to the incorporation of an additional interfacial area between the CNTs and the matrix, which is active at the nanoscale. However, this additional interface could have a negative effect on the environmental durability of the aforementioned systems, since it is well known that the moisture absorption ability of a matrix is enhanced by the presence of multiple interfaces, which serve as an ingress route to water. To examine this problem, CNT-modified CFRPs were exposed to hydrothermal loadings. At specified intervals, the composites were weighted, and the water uptake vs. time was recorded for both the modified and a reference systems. The electrical conductivity of the composites was registered at the same time intervals. After the environmental exposure, the interlaminar shear properties of the conditioned composite systems were measured and compared with those of unmodified composites, as well as with the shear properties of unexposed laminates.