Ahmad Ahmad Fahad, Aziz Sidek Ab, Obaiys Suzan Jabbar, Zaid Mohd Hafiz Mohd, Matori Khamirul Amin, Samikannu Kanagesan, Aliyu Umar Sa'as
Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400, Malaysia.
School of Mathematical & Computer Sciences, Heriot-Watt University Malaysia, Putrajaya 62200, Malaysia.
Polymers (Basel). 2020 Feb 12;12(2):427. doi: 10.3390/polym12020427.
This paper presents the electromagnetic interference properties of multi-walled carbon nanotubes (MWCNTs) as a novel nano-reinforcement filler in poly (lactic acid) (PLA)/poly (ethylene glycol) (PEG) polymer matrix that was prepared via melt blending mode. Plasticization of PLA was first carried out by PEG, which overcomes its brittleness problem, in order to enhance its flexibility. A waveguide adapter technique was used to measure the dielectric properties εr, and S-parameters reflection (S) and transmission (S) coefficients. The dielectric properties, microwave attenuation performances, and electromagnetic interference shielding effectiveness (EMISE) for all the material under test have been calculated over the full X-Band (8-12 GHz) due to its importance for military and commercial applications. The prepared samples were studied while using X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transforms infrared spectroscopy (FTIR), mechanical properties measurements, as well as thermogravimetric analysis (TGA). The results showed that the dielectric properties increased with increased multi-walled carbon nanotubes (MWCNTs) filler, as well as the shielding effectiveness of the MWCNT/PLA/PEG nanocomposites increased with the increasing of MWCNTs. The highest SE total value was found to be 42.07 dB at 12 GHz for 4 wt% filler content. It is also observed that the attenuation values of the nanocomposites increased with an increase in MWCNTs loading, as well as the power loss values for all of the samples increased with the increase in MWCNTs loading, except the amount of the transmitted wave through the nanocomposites.
本文介绍了多壁碳纳米管（MWCNTs）作为一种新型纳米增强填料，在通过熔融共混模式制备的聚乳酸（PLA）/聚乙二醇（PEG）聚合物基体中的电磁干扰特性。首先通过PEG对PLA进行增塑，以克服其脆性问题，从而提高其柔韧性。采用波导适配器技术测量介电常数εr以及S参数反射（S）和传输（S）系数。由于其对军事和商业应用的重要性，已在整个X波段（8 - 12 GHz）计算了所有测试材料的介电性能、微波衰减性能和电磁干扰屏蔽效能（EMISE）。在使用X射线衍射（XRD）、场发射扫描电子显微镜（FE - SEM）、傅里叶变换红外光谱（FTIR）、力学性能测量以及热重分析（TGA）的同时，对制备的样品进行了研究。结果表明，随着多壁碳纳米管（MWCNTs）填料含量的增加，介电性能增强，并且MWCNT/PLA/PEG纳米复合材料的屏蔽效能也随着MWCNTs含量的增加而提高。对于4 wt%的填料含量，在12 GHz时发现最高的SE总值为42.07 dB。还观察到，纳米复合材料的衰减值随着MWCNTs负载量的增加而增加，并且所有样品的功率损耗值也随着MWCNTs负载量的增加而增加，但通过纳米复合材料的透射波量除外。
