Rubežienė Vitalija, Varnaitė-Žuravliova Sandra, Sankauskaitė Audronė, Pupeikė Julija, Ragulis Paulius, Abraitienė Aušra
Department of Textile Technologies, Center for Physical Sciences and Technology, 48485 Kaunas, Lithuania.
Physical Technology Department, Center for Physical Sciences and Technology, 10257 Vilnius, Lithuania.
Polymers (Basel). 2023 Oct 25;15(21):4224. doi: 10.3390/polym15214224.
Minimizing the impact of electromagnetic radiation (EMR) holds paramount importance in safeguarding individuals who frequently utilize electrical and electronic devices. Electrically conductive textiles, which possess specialized EMR shielding features, present a promising solution to mitigate the risks related to EMR. Furthermore, these textile-based shielding materials could find application as radar-absorbing materials in stealth technology, emphasizing the need for substantial absorption capabilities in shielding mechanisms. In this study, various textile-based materials with an electrically conductive coating that contain the conjugated polymer system poly(3,4-ethylene-dioxythiophene)-polystyrene sulfonate (PEDOT:PSS) were prepared and investigated. The influence of the textile substrate structural parameters, coating deposit, and coating method on their microwave properties-transmission, reflection, and absorption-was investigated. Reflection and transmission measurements were conducted within a frequency range of 2 to 18 GHz. These measurements revealed that, for the tested samples, the shielding properties are determined by the combined effect of reflection and absorption. However, the role of these two parameters varies across the tested frequency range. It was defined that for fabrics coated on one side, better reflection reduction is obtained when the shielding effectiveness (SE) is below |20| dB. It was found that by controlling the coating deposition on the fabric, it is possible to fine-tune the electrical properties to a certain extent, thereby influencing the microwave properties of the coated fabrics. The studies of prepared samples have shown that reflection and transmission parameters depend not only on the type and quantity of conductive paste applied to the fabric but also on the fabric's construction parameters and the coating technique used. It was found that the denser the substrate used for coating, the more conductive paste solidifies on the surface, forming a thicker coat on the top. For conductive fabrics with the same substrate to achieve a particular SE value using the knife-over-roll coating technology, the required coating deposit amount is considerably lower as compared with the deposit necessary in the case of screen printing: for the knife-over-roll-coated sample to reach SE 15 dB, the required deposit is approximately 14 g/m; meanwhile, for a sample coated via screen printing, this amount rises to 23 g/m.
将电磁辐射（EMR）的影响降至最低对于保护经常使用电气和电子设备的个人至关重要。具有特殊EMR屏蔽功能的导电纺织品为降低与EMR相关的风险提供了一个有前景的解决方案。此外，这些基于纺织品的屏蔽材料可作为隐身技术中的雷达吸收材料，这凸显了屏蔽机制中强大吸收能力的必要性。在本研究中，制备并研究了各种含有共轭聚合物体系聚（3,4-亚乙基二氧噻吩）-聚苯乙烯磺酸盐（PEDOT:PSS）的具有导电涂层的基于纺织品的材料。研究了纺织品基材结构参数、涂层沉积量和涂层方法对其微波特性——传输、反射和吸收——的影响。在2至18 GHz的频率范围内进行了反射和传输测量。这些测量结果表明，对于测试样品，屏蔽性能由反射和吸收的综合作用决定。然而，这两个参数的作用在测试频率范围内有所不同。已确定对于单面涂层的织物，当屏蔽效能（SE）低于|20| dB时可获得更好的反射降低效果。研究发现，通过控制织物上的涂层沉积，可以在一定程度上微调电学性能，从而影响涂层织物的微波特性。对制备样品的研究表明，反射和传输参数不仅取决于施加到织物上的导电浆料的类型和数量，还取决于织物的结构参数和所使用的涂层技术。研究发现，用于涂层的基材越致密，表面固化的导电浆料就越多，并在顶部形成更厚的涂层。对于使用辊刀涂布技术的具有相同基材的导电织物，要达到特定的SE值，所需的涂层沉积量与丝网印刷情况下所需的沉积量相比要低得多：对于辊刀涂布样品达到SE 15 dB，所需沉积量约为14 g/m；同时，对于通过丝网印刷涂布的样品，该量增加到23 g/m。
