The influence of two types of functional particles on the electromagnetic properties and mechanical properties of double-layer coated basalt fiber fabrics

Zhao

2021

Self Cite

In this paper, firstly, polypyrrole was prepared by in situ polymerization using pyrrole as the monomer, hexahydrate ferric chloride as the oxidizer and dopant, and polyethylene geotextile as the substrate to prepare a polypyrrole/polyethylene short filament geotextile composite; secondly, the electromagnetic microwave absorption property and shielding property of the polypyrrole/polyethylene short filament geotextile composite were investigated; finally, the chemical structure of the polypyrrole/polyethylene short filament geotextile composite was characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), X-ray diffraction (XRD), and Raman test methods. The results show that the reflection loss value is up to the minimum value of –17.53 dB in the frequency range of 0–3 GHz and the best absorbing performance is obtained at the frequency of 1.12 GHz. In the frequency range of 0.95–1.25 GHz, the reflection loss value is less than –10 dB, and the electromagnetic wave is effectively absorbed. The shielding effectiveness value is up to the maximum value of 16.07 dB at the frequency of 1.19 GHz, that is, the shielding ability becomes strongest at the frequency of 1.19 GHz; otherwise, the shielding effectiveness is higher than 14 dB in the frequency range of 0.17–3.0 GHz. The FTIR, Raman, XRD, and DSC tests result show that polypyrrole has been successfully loaded on the polyethylene geotextile, improving the crystallinity and thermal stability property of the composite.

“…With the increase of frequency, polypyrrole undergoes dielectric polarization, prompting the conversion of electromagnetic microwaves into heat and dissipation. 27…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Study Of the Electromagnetic Property Of Polypyrrole/ Polyet...mentioning

confidence: 99%

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Preparation and characterization of an electromagnetic composite polypyrrole/polyethylene short filament geotextile

Yang

Zhao

2021

Self Cite

“…If one type of material with a large dielectric constant was placed in the electric field, the strength of the electric field will decrease in a dielectric medium, and thus it can be used as a physical parameter to characterize the dielectric property or polarization property for dielectric materials. 30,31 In this experiment, a BDS50 dielectric spectrometer was used to measure the dielectric constant, and a small square of 20 mm Â 20 mm was cut on the coated fabric for testing.…”

Section: Test Indicators and Methodsmentioning

confidence: 99%

Preparation and study of electromagnetic properties of graphene/graphite/bismuth oxide three-layer coated textile materials

Wang

et al. 2021

Self Cite

Three-layer coated composites with good electromagnetic properties were prepared on a plain polyester–cotton blended fabric with PU2540 polyurethane resin as a matrix; graphene, graphite and bismuth oxide were used as coating functional particles; and the influences of types of surface-layer functional particles, middle-layer functional particles and bottom-layer functional particles on electromagnetic properties of three-layer composites were explored. Results showed that when graphite, graphene and graphene were respectively used as bottom-layer, middle-layer and surface-layer functional particles, within the range of 1–1000 MHz, the polarization, dissipation and absorption-attenuation ability of the coated composite to electromagnetic waves was the strongest, and within the range of 10–3000 MHz, the wave-absorbing properties and shielding properties to electromagnetic waves of the coated composite were the strongest. When the frequency was 1600.7 MHz, the value of the reflection loss of the sample was the minimum, which reached –7.15 dB.

“…26 In this paper, single-layer coated composites were prepared by using PU-2540 polyurethane as the matrix, graphite, bismuth and bismuth oxide as functional particles, and adopting the coating process on plain weave polyester/cotton fabric. [27][28][29] The influence of the contents and ratio of the graphite, bismuth and bismuth oxide on the electromagnetic properties and mechanical property of composites were studied.…”

mentioning

confidence: 99%

A study on the electromagnetic properties of graphite/bismuth/bismuth oxide-coated composites

Yang

2021

Self Cite

Coating is a commonly used process for the preparation of protective textiles. In this study, the absorbing coated composite material was prepared by a coating process, using plain weave polyester/cotton fabric as the base fabric, PU-2540 polyurethane as the binder, and graphite, bismuth and bismuth oxide as the functional particles. The effects of the content of functional particles and the ratio of functional particles on the dielectric constant, reflection loss, shielding effectiveness, and tensile strength of the single-layer coating composites were studied using the control variable method. The results showed that when the frequency was 1–1000 MHz, the real and imaginary parts of the dielectric constant, the tangential value of the loss angle, and the tensile value increased with the increase of the coating content, and the polarization, loss and attenuation property, and mechanical property of the electromagnetic wave were enhanced. When graphite, bismuth, and bismuth oxide was mixed at the ratio of 9:0:0 in weight, the polarization property was the best. When mixed at the ratio of 6:1:2 in weight, the loss performance and attenuation ability were the best. When mixed at the ratio of 6:3:0 in weight, the absorbing property and mechanical property were the best. When mixed at the ratio of 6:2:1 in weight, the shielding property was the best.