ABSTRACT

In this study, the microwave-absorption characteristics of multi-layered radar-absorbing structures (RASs) were investigated. Electrical-grade glass (e-glass)/epoxy composites containing modified multi-walled carbon nanotubes (MWCNTs) were fabricated. The poly aniline (PANI) coated MWCNTs was obtained by in-situ polymerisation of aniline in the presence of MWCNTs. The PANI-coated MWCNTs (PCNTs) were then used as reinforcements in the polymer matrix, and their morphologies, microstructures, thermal stabilities, and microwave-absorbing properties were investigated. The complex permittivity and permeability of the composites were measured and found to have increased with increasing filler concentration. Microwave absorbing properties were analysed via waveguide measurement. The three-layered RASs reinforced with PCNTs having a thickness of 4 mm exhibited a RL of –5 dB over the entire X-band and a reflection peak of –24.53 dB at 10.0 GHz. Hence, the epoxy/PCNTs composites are suitable for use in microwave-absorption applications.

摘要

在这项研究中，研究了多层雷达吸收结构（RAS）的微波吸收特性。制备了包含改性多壁碳纳米管（MWCNT）的电子级玻璃（e-glass）/环氧树脂复合材料。通过原位获得聚苯胺（PANI）涂层的MWCNT在多壁碳纳米管存在下苯胺的聚合。然后将PANI涂层的MWCNTs（PCNTs）用作聚合物基质中的增强材料，并研究了它们的形貌，微观结构，热稳定性和微波吸收特性。测量了复合材料的复介电常数和渗透率，发现其随着填料浓度的增加而增加。通过波导测量来分析微波吸收特性。用厚度为4 mm的PCNT增强的三层RAS在整个X波段的RL为–5 dB，在10.0 GHz处的反射峰为–24.53 dB。因此，环氧树脂/ PCNTs复合材料适用于微波吸收应用。