With the rapid development of modern science and technology, a kind of invisible pollution named electromagnetic radiation has increasingly attracted the attention of all sectors of society. Therefore, electromagnetic shielding protective clothing is widely used by people for daily life and work. More and more scholars and researchers are paying attention to this research direction, and they have done a series of related research on how to improve the electromagnetic shielding effectiveness of clothing materials. At the same time, the related comfort properties of these clothing materials should also be concerned because they will greatly affect the wearer’s experience. This study evaluated the related comfort properties of a kind of copper-plated nonwoven materials with different electromagnetic shielding effectiveness, including air permeability, water vapor permeability, and thermal resistance. The result shows that electromagnetic shielding effectiveness is positively related to the amount of plated copper based on this kind of copper plating method. Other experiment results display that air permeability and water vapor permeability of this kind of material are negatively related to its electromagnetic shielding effectiveness. On the contrary, their thermal resistance is positively related to their electromagnetic shielding effectiveness. In addition to the above, it also found that air permeability and water vapor permeability have a positive correlation with optical porosity, and thermal resistance has a positive correlation with volume porosity.
This paper investigates the electromagnetic interference shielding effect and wearing comfort properties of a sandwich material consisting of a surface layer, an electromagnetic interference shielding layer, a thermal insulation layer, and a lining layer. The main aim is to research its potential as a winter jacket’s material for shielding electromagnetic radiation and the relationship between single-layer fabric samples and multi-layer sandwich materials under different properties. Experimentally, it is found that the electromagnetic interference shielding effectiveness of the sandwich materials is only determined by the electromagnetic interference shielding layer fabric sample, the other layers’ fabric samples have no significant impact on the electromagnetic interference shielding effect. In this paper, the air permeability of the sandwich materials is 25 to 50% lower than that of the single-layer fabric samples with the lowest air permeability in their combination. And the water vapor resistance of the sandwich materials is 40 to 60% higher than that of the single-layer fabric samples with the highest water vapor resistance in their combination. The thermal resistances of the sandwich materials measured by the Alambeta are lower than those calculated by the sum of the individual layers’ thermal resistance, which may be caused by the reduction in the internal air of the sandwich materials. Finally, the quality index evaluation is used to select the most suitable sandwich material for the winter jacket against electromagnetic radiation, which achieves the purpose of balancing the electromagnetic interference shielding effect and wearing comfort.
Electromagnetic interference shielding clothing has been developed for people who is sensitive to electromagnetic radiation or workers working under extremely high electromagnetic radiation circumstances. The challenge was developing the fabric with good washability, durability, and air permeability. After three machine washing cycles, the electromagnetic interference shielding effectiveness can drop more than 99% for untreated copper-coated fabric. In this research, the chlorinated poly-para-xylylene (parylene C) encapsulating technology was used to protect the fiber's copper particles. The result shows that the treated sample's washing ability will significantly improve after processing 15 g parylene-C on the copper-coated fabrics. The electromagnetic interference shielding effectiveness can remain at 39.93 dB and 25 dB on average from 30 MHz to 3 GHz after 10 hand washing cycles and 10 machine washing cycles, respectively. The air permeability remains around 1043.6 mm/s for a 15 g parylene-C encapsulated sample. The chemical resistance property was also improved significantly after encapsulation of 15 g parylene-C. For the 15 g parylene-C encapsulated samples, there is less than 3% loss of electromagnetic interference shielding effectiveness after 8 h of immersing into pH = 2 and pH = 12 solution. The overall structure of the 15 g parylene-C encapsulated fabric remains intact after 6000 abrasion cycles. The study presents an effective method for fabricating highly durable, comfortable electromagnetic interference shielding fabric, guaranteeing reliability for technical clothing applications and showing great potential for further development.
This paper investigated the washability and comfort properties of a kind of electromagnetic interference shielding material (Meftex10) with and without the parylene C coating. Parylene C can form a uniform protective film on the fabric and improve different properties of the fabric. In this paper, it will be used to improve the washability of electromagnetic interference shielding material. Through a large number of experiments, it can be determined that the parylene C coated samples have a significant improvement in washability compared to the uncoated samples. When the sample’s parylene C coating content arrives at 33.4 g/m², its electromagnetic shielding effectiveness still remains around 65% after 10 times washing cycles. Conversely, as the content of the parylene C coating increases, the air permeability of the samples as well as the water vapor permeability will decrease. The reason is that the parylene C coating closes some of the pores, which affects air and water vapor transport through the material. In addition to this, it can be concluded that the thermal conductivities of samples increase with increasing parylene C coating contents. The above phenomenon is caused by the following two aspects: The parylene C coating material will reduce the spaces between the fibers and yarns by partially filling the pores, leading to less still air inside and the fabric has a greater capacity for heat transfer; Parylene C has a higher thermal conductivity than the electromagnetic interference shielding material (Meftex10).
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