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. 2020 Sep 5;12(9):2029.
doi: 10.3390/polym12092029.

Resistance against Penetration of Electromagnetic Radiation for Ultra-light Cu/Ni-Coated Polyester Fibrous Materials

Kai Yang  1 , Aravin Prince Periyasamy  1 , Mohanapriya Venkataraman  1 , Jiri Militky  1 , Dana Kremenakova  1 , Josef Vecernik  2 , Roman Pulíček  3
Affiliations

Resistance against Penetration of Electromagnetic Radiation for Ultra-light Cu/Ni-Coated Polyester Fibrous Materials

Kai Yang et al. Polymers (Basel). .

Abstract

Resistance against penetration of various rays including electromagnetic waves (EM), infrared rays (IR), and ultraviolet rays (UV) has been realized by using copper (Cu)-coated fabrics. However, the corrosion of the Cu on coated fabrics influenced the shielding effectiveness of the various rays. Besides, the metal-coated fabrics have high density and are unbreathable. This work aims to solve the problem by incorporating nickel (Ni) into the Cu coating on the ultra-light polyester fibrous materials (Milife® composite nonwoven fabric-10 g/m2, abbreviation Milife) via electroless plating. The electromagnetic interference (EMI), IR test, ultraviolet protection factor (UPF), water contact angle, and air permeability of the Cu/Ni-coated Milife fabric were measured. All the samples were assumed as ultra-light and breathable by obtaining the similar fabric density (~10.57 g/m2) and large air permeability (600-1050 mm/s). The Cu/Ni deposition on the Milife fabrics only covered the fibers. The EM shielding effectiveness (SE) decreased from 26 to 20 dB, the IR reflectance (Rinfrared) decreased from 0.570 to 0.473 with increasing wNi from 0 to 19.5 wt %, while the wNi improved the UPF from 9 to 48. Besides, addition of Ni changed the Cu/Ni-coated Milife fabric from hydrophilicity to the hydrophobicity by observing WCA from 77.7° to 114°.

Keywords: Cu/Ni deposition; UV protection; electrical resistance; electroless plating; electromagnetic shielding effectiveness; thermal radiation resistance; water contact angle.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Measurement of electrical resistance for Cu/Ni-coated Milife fabric.
Figure 2
Figure 2
Scheme of the spectral reflectance measurement.
Figure 3
Figure 3
Measurement of thermal insulation for Cu/Ni-coated Milife fabric.
Figure 4
Figure 4
Microscopic images of Cu/Ni-coated Milife fabric (a) sample N0; (b) sample N5; (c) sample N8.
Figure 5
Figure 5
A cross sectional view of Cu/Ni-coated Milife fabric (a) sample N0; (b) sample N8.
Figure 6
Figure 6
Structural change between the Milife fabric (N0) and the Cu/Ni-coated Milife fabric.
Figure 7
Figure 7
Air permeability of Cu/Ni-coated Milife fabric.
Figure 8
Figure 8
EMI results of Cu/Ni-coated Milife fabric (A) EM SE curves; (B) SER curves; (C) scheme of the EM in the fabric; (D) relationship between wNi and EM SE; (E) relationship between wNi and both TEM and REM; (F) relationship between wNi and both Aeff,EM and Em,EM.
Figure 8
Figure 8
EMI results of Cu/Ni-coated Milife fabric (A) EM SE curves; (B) SER curves; (C) scheme of the EM in the fabric; (D) relationship between wNi and EM SE; (E) relationship between wNi and both TEM and REM; (F) relationship between wNi and both Aeff,EM and Em,EM.
Figure 9
Figure 9
UV transmittance of Cu/Ni-coated Milife fabric over 290–400 nm (UVA and UVB).
Figure 10
Figure 10
The relationship between UPF and wNi.
Figure 11
Figure 11
Analysis of infrared resistance of Cu/Ni-coated Milife Fabric (A) absorptance curves; (B) transmittance curves; (C) reflectance curves incorporated with the relationship between wNi and Rinfrared at 10 μm; (D): relationship between wNi and Em,infrared.
Figure 12
Figure 12
Relationship between WCA of Cu/Ni-coated fabrics and wNi.
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