Achieving structurally and functionally integrated electromagnetic shielding composites based on polyetheretherketone by sandwich structure

2021 ◽  
pp. 109963622110204
Author(s):  
Tong Hua Wu ◽  
Xiao Han Mei ◽  
Liu Bo Liang ◽  
You Mei Ma ◽  
Gui Bin Wang ◽  
...  
Keyword(s):  
Surface Layer ◽  
Sandwich Structure ◽  
Fine Powder ◽  
Core Layer ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Multi Wall Carbon Nanotubes ◽  
The Core ◽  
Electromagnetic Shielding Effectiveness ◽  
Shielding Composites

This study aims to prepare a structurally and functionally integrated polyetheretherketone/multi-wall carbon nanotubes (PEEK/MWCNTs) electromagnetic shielding composites by sandwich structure. The PEEK ultra-fine powder and MWCNTs mixed by mechanical blending were selected as the core-layer and PEEK-based film acted as the surface-layer. The results indicate that the electromagnetic shielding effectiveness (SE) and mechanical properties of the composites can be controlled by adjusting the ratio of PEEK which was chosen as the binder in the core-layer, the number of the core-layer and the composition of the surface-layer without sacrificing their thermal stability. Moreover, the specific electromagnetic shielding effectiveness (SSE), electrical conductivity, tensile strength and temperature of 5% weight loss (Td5%) of the optimized PEEK/MWCNTs composite reach 79.5 dB/mm, 1.8 S/cm, 93 MPa and 594°C, respectively. The performances of the above composite are obviously superior to those of the recently reported EMI composites. The improvements in the properties should be mainly attributed to the two factors: the dense conductive network formed by MWCNTs in the core-layer, and the good interface adhesion between MWCNTs-MWCNTs in the core-layer as well as between the core-layer and the surface-layer.

scholarly journals Electromagnetic interference shielding characteristics of a core layer-coated fabric with excellent hand-feel characteristics

2020 ◽  
Vol 15 ◽  
pp. 155892502095973
Author(s):  
D Xu ◽  
WW Yang ◽  
HM Jiang ◽  
H Fan ◽  
KS Liu
Keyword(s):  
Surface Layer ◽  
Electromagnetic Interference ◽  
Core Layer ◽  
Polyvinyl Butyral ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Electron Microscopic ◽  
The Core ◽  
Coated Fabric

Electromagnetic shielding fabric (ESF) is a novel electromagnetic shielding product with portability, flexibility, and good mechanical properties. However, the existing ESFs suffer from poor washing fastness of coating and poor comfort performance in terms of hand-feel characteristic. In this study, a core layer-coated yarn (CLCY) was successfully spun using a carboxylic acid-functionalized multi-walled carbon nanotube/polypyrrole/Fe3O4 composite suspension with polyvinyl butyral as an adhesive agent. To better explore the properties, the original fabric and treated fabrics, viz., core layer-coated fabric (CLCF) and surface layer-coated fabric (SLCF), were characterized by several methods. Scanning electron microscopic observations revealed that the coating was on the core layer in CLCF. In addition, the Fourier-transform infrared spectroscopy and X-ray diffraction spectroscopy results revealed that the composition of the coating corresponds with that in the multi-composite suspension. Moreover, the coating of CLCY formed a conductive path with good conductivity in the core layer, but the conductivity of the coating on the surface layer of SLCF deteriorated sharply after washing. Further, compared with the original fabric and SLCF, CLCF has highest breaking strength (after 10 washes), and keeps a relatively good hand-feel characteristic. Finally, the evaluated electromagnetic interference shielding characteristics reveal that the fastness of coating affects the electromagnetic shielding effectiveness, suggesting that the wrapped protection of outside staple fibers in CLCF reduce the loss of coating in the core layer during washing. However, the coating on the surface layer in SLCF could be washed away easily.

Study to Wood Electromagnetic Shielding Composites Laminated with Aluminum Plates

2011 ◽  
Vol 280 ◽  
pp. 159-164 ◽  
Author(s):  
Ke Yang Lu ◽  
Feng Fu ◽  
Yue Jin Fu ◽  
Zhi Yong Cai
Keyword(s):  
Electromagnetic Interference ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Building Product ◽  
Static Modulus ◽  
Electrical Devices ◽  
Aluminum Plates ◽  
Static Modulus Of Elasticity ◽  
Electromagnetic Shielding Effectiveness ◽  
Shielding Composites

Radiations from different electrical devices cause electromagnetic interference which will influence the performance realization of other electromagnetic device and cause the health concerns. The aluminum plates were then used to develop wood electromagnetic shielding composites by laminating with the plywood. Their static modulus of elasticity and electromagnetic shielding effectiveness of the composites with different thickness and position of aluminum plates were evaluated. The results showed that the strength of composites were improved by laminating the aluminum plates on the surface. The electromagnetic shielding performance of the composites were increased by the design of the multilayer and sandwich shielding structure. Again, It was also found that the composites made by laminating two aluminum plates (1mm, in the middle or on the surface) had a better shielding effectiveness (60 dB to 92 dB, 60 dB to 106 dB, Ranged from 1 GHz to 10 GHz) and met the requirement for a commercial electromagnetic shielding building product.

Manufacture and evaluations of stainless steel/rayon/bamboo charcoal functional composite knits

2019 ◽  
Vol 89 (19-20) ◽  
pp. 3893-3899 ◽  
Author(s):  
Pei-Chen Hsiao ◽  
Chin-Mei Lin ◽  
Chao-Tsang Lu ◽  
Wei Yin ◽  
Yu-Tien Huang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Surface Resistance ◽  
Elastic Recovery ◽  
Electromagnetic Shielding ◽  
Bamboo Charcoal ◽  
Shielding Effectiveness ◽  
Functional Composite ◽  
The Core ◽  
The Face ◽  
Electromagnetic Shielding Effectiveness

This study proposes composite knits that have multiple functionalities to fit a diversity of applications. Stainless steel/rayon (S/R) wrapped yarns are used as the sheath and bamboo (B) charcoal polyester yarns are used as the core to form SRB wrapped yarns. The SRB wrapped yarns are made at number of twists of 2, 3, 4, 5, or 6 turns/cm. Moreover, the composite knits are made of SRB wrapped yarns as the face yarns and Tetoron® yarns as the ground yarns using a computer jacquard hose machine. The surface resistance, electromagnetic shielding effectiveness (EMSE), elastic recovery, anion release, and softness of the composite knits are measured, investigating the influence of the number of twists as well as the functionalities of the composite knits. When the number of twists is 4 turns/cm, the composite knits have an optimal elastic recovery of above 71.8%, optimal anion release of 408 counts/cm3, a greater softness along the wale direction, and optimal EMSE of 20 dB at frequencies of 2.18E+08 Hz.

Analyses on the Manufacture and Physical Properties of Electromagnetic Shielding/ Far Infrared Ray Nonwoven

2010 ◽  
Vol 97-101 ◽  
pp. 1790-1793
Author(s):  
Jia Horng Lin ◽  
Yu Tien Huang ◽  
Chin Mei Lin ◽  
Yi Chang Yang ◽  
Chien Teng Hsieh ◽  
...  
Keyword(s):  
Physical Properties ◽  
Far Infrared ◽  
Electromagnetic Shielding ◽  
Breaking Force ◽  
Shielding Effectiveness ◽  
Machine Direction ◽  
Tear Strength ◽  
Burst Strength ◽  
Far Infrared Ray ◽  
Electromagnetic Shielding Effectiveness

According to the results, when low melting polyester fiber increased to be 20%, the electromagnetic shielding/ far infrared ray nonwoven obtained the optimum burst strength, maximum breaking force and maximum tear strength, and they were as follows: burst strength was 4.2 kgf/cm2; maximum breaking force was 153.59 N in the cross machine direction and 70.80 N in the machine direction; maximum tear strength was 215.77 N in cross machine direction and 117.07 N in machine direction; and optimum electromagnetic shielding effectiveness (EMSE) was 45 dB.

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