The preparation and performance of polyaniline coated polyester fabrics

Cao

et al. 2022

Self Cite

In this project, polyaniline powder was firstly prepared by in situ polymerization using aniline as the monomer, ammonium persulfate as the oxidant, and camphor sulfonic acid as the dopant. Next, polyester-cotton fabrics were used as the base fabrics, polyaniline, cobalt ferrite, and carbon fiber powder as the functional particles, and PU-2540 type polyurethane as the base, and single-layer coated polyester-cotton fabrics were prepared by the textile coating process. Finally, the effects of the polyaniline, cobalt ferrite, and carbon fiber powder doping ratio and functional particle content on the shielding effectiveness, reflection loss, real and imaginary parts of the dielectric constant, and loss angle tangent of single-layer coated polyester-cotton fabrics were focused on using the controlled variable method. The results show that in the frequency range of 0.01–3 GHz, when the doping ratio of polyaniline, cobalt ferrite, and carbon fiber powder is 1:0:3, and when the content of functional particles is 40%, the minimum reflection loss of single-layer coated polyester-cotton fabrics is –22.1 dB at 1.6 GHz, and the effective absorption bandwidth is 1.14 GHz.

Section: Methodsmentioning

confidence: 99%

“…The test band was set from 0.01 to 3.0 GHz, and the coated fabrics were cut into a ring with an inner diameter of 33.1 mm and an outer diameter of 76.2 mm and placed in the test instrument for testing. 24,25 Dielectric properties test. In this experiment, a BDS50 dielectric spectrometer was selected to test the dielectric constant, referring to the standard SJ20512-1995 "Test methods for permittivity and permeability of microwave high loss solid materials."…”

Section: Main Experimental Equipmentmentioning

confidence: 99%

Effect of doping ratio and amount of polyaniline, cobalt ferrite, and carbon fiber powder on the electromagnetic properties of coated polyester-cotton fabrics

Cao

et al. 2022

Self Cite

Section: Methodsmentioning

confidence: 99%

“…The test band was set from 0.01 to 3.0 GHz, and the coated fabrics were cut into a ring with an inner diameter of 33.1 mm and an outer diameter of 76.2 mm and placed in the test instrument for testing. [23][24][25][26] Dielectric properties test. The dielectric constant is one of the very important electromagnetic parameters of wave-absorbing materials; it is the ratio of the capacitance value in the same capacitor with a substance as the dielectric and the capacitance value with vacuum as the dielectric, expressed by e. The dielectric constant characterizes the ability of dielectric materials to accommodate the induced polarization charge, where the size of the value mainly depends on the difficulty of the polarization process in the electric field excitation; the more material polarization-induced charge in the external electric field, the larger the dielectric constant, and vice versa, the smaller the dielectric constant.…”

Section: Main Experimental Equipmentmentioning

confidence: 99%

Effect of the cobalt ferrite and carbon fiber powder doping ratio on the electromagnetic properties of coated polyaniline-based polyester–cotton fabric

Chao

et al. 2021

Self Cite

In this project, firstly, polyaniline-based polyester–cotton fabric was prepared by in situ polymerization using polyester–cotton fabric as the base fabric, aniline as the monomer, ammonium persulfate as the oxidizer, and camphor sulfonic acid as the dopant. Secondly, cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric was prepared by the textile coating process using polyaniline-based polyester–cotton fabric as the base fabric, PU2540-type polyurethane as the adhesive, and cobalt ferrite and carbon fiber powder as functional particles. Finally, the effect of the cobalt ferrite and carbon fiber powder doping ratio on the shielding effectiveness, reflection loss, dielectric constant real part, imaginary part, and loss angle tangent of cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric was studied by using the controlled variable method with emphasis on the cobalt ferrite/carbon fiber powder doping ratio. The results show that in the frequency range of 0.01–3.0 GHz, when the doping ratio of cobalt ferrite to carbon fiber powder is 0:3, the reflection loss of cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric reaches the minimum value at 1.49 GHz, the minimum reflection loss is –21.4 dB, and the effective absorption band is 1.25–1.94 GHz. In the test band, the shielding efficiency, reflection loss, the real part and imaginary part of the dielectric constant, and the loss angle tangent of the carbon fiber powder-coated polyaniline-based polyester–cotton fabric are larger than those of cobalt ferrite-coated polyaniline-based polyester–cotton fabric. The smaller the doping ratio of cobalt ferrite to carbon fiber powder, the larger value of the shielding efficiency, reflection loss, the real part and imaginary part of the dielectric constant, and loss angle tangent of the cobalt ferrite/carbon fiber powder-coated polyaniline-based polyester–cotton fabric.

“…The group has prepared polyaniline/nylon, polyaniline/polyester, and polyaniline/cotton composites by in situ polymerization, and studied the effects of the dopant type and amount, aniline concentration, oxidant concentration, and other process parameters on the dielectric property of the composite, the results of which show that when the dopant is p-toluenesulfonic acid and the concentration of aniline is 0.4 mol/ L, the dielectric properties are the best. [24][25][26][27] However, EMW absorbing property studies and characterization analysis were not performed. Therefore, in this paper, a polyaniline/pre-oxidized fiber felt composite was firstly prepared by in situ polymerization using pre-oxidized fiber felt as the substrate, aniline as the monomer, ammonium persulfate as the oxidant, and p-toluenesulfonic acid as the dopant.…”

mentioning

confidence: 99%

Characterization of a polyaniline/pre-oxidized fiber felt electromagnetic wave absorbing composite

Zhao

2021

Self Cite

Firstly, a polyaniline/pre-oxidized fiber felt composite was prepared by in situ polymerization using pre-oxidized fiber felt as the substrate, aniline as the monomer, ammonium persulfate as the oxidant, and p-toluenesulfonic acid as the dopant. Secondly, the electromagnetic wave absorbing property and tensile property of the polyaniline/pre-oxidized fiber felt composite were investigated. Finally, the structure and composition were characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, and differential scanning calorimetry. The results show that the reflection loss of the polyaniline/pre-oxidized fiber felt composite is the smallest at the 3000 MHz frequency, reaching –8.23 dB, and the average surface resistance is 2059.84 Ω, with good conductivity. The characterization analysis shows that polyaniline has been successfully loaded on the pre-oxidized fiber felt, and the protonation reaction occurs at the nitrogen atom on the imine -N-. The polyaniline structure is doped by p-toluenesulfonic acid with a certain degree of order and crystallinity, and the composite has good thermal stability.