Electrically conductive gradient structure design of thermoplastic polyurethane composite foams for efficient electromagnetic interference shielding and ultra-low microwave reflectivity

Lei，Zuomin1; Tian，Dingkun1; Liu，Xuebin1,2; Wei，Jianhong1,3; Rajavel，Krishnamoorthy1; Zhao，Tao1; Hu，Yougen1; Zhu，Pengli1; Sun，Rong1; Wong，Ching Ping4

2021-11-15

10.1016/j.cej.2021.130365

CHEMICAL ENGINEERING JOURNAL   影响因子和分区

1385-8947

Lightweight and compressible composite foams consisting of silver fractal dendrites (AgFDs), carbon nanotubes (CNTs) and thermoplastic polyurethane (TPU) are developed through layer-by-layer construction, followed by freeze-drying. The construction of AgFD/TPU layers through depositing AgFD layers followed by low-temperature sintering and incorporating of TPU endows the AgFD/TPU layers with excellent electrical conductivity. Meanwhile, the electrically conductive gradient CNT/TPU layers constructed by layer-by-layer method greatly decrease the reflection of the electromagnetic (EM) waves and prolong the EM wave dissipation paths. The unique low reflection–absorption-high reflection-reabsorption paths of the EM wave dissipation mechanism facilitates the composite foams with thickness of 3.4 mm to obtain an excellent EMI SE of 88.5 dB and an ultra-low SE of 0.29 dB at an extreme low AgFD loading of 0.103 vol%. Additionally, benefitting from direction freezing, the composite foams exhibit good cyclic compression recovery. This work puts forward a new insight for designing and constructing ultra-efficient absorption-dominated EMI shielding materials with electrically conductive gradient layers, and the prepared shielding materials are highly promising for applications in the EMI protection of modern electronic products.

Electrically conductive gradient Electromagnetic interference shielding Freeze-drying Lightweight composite foam Reflection

EI ; SCI

英语

其他

WOS:000707037200050

20212310452368

Carbon nanotubes ; Conductive materials ; Electromagnetic pulse ; Electromagnetic shielding ; Electromagnetic wave interference ; Foams ; Low temperature drying ; Polyurethanes ; Product design ; Reinforced plastics ; Sintering ; Temperature ; Yarn

Thermodynamics:641.1 ; Electricity and Magnetism:701 ; Conducting Materials:708.2 ; Electromagnetic Waves:711 ; Information Theory and Signal Processing:716.1 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Organic Polymers:815.1.1 ; Polymer Products:817.1 ; Fiber Products:819.4 ; Production Engineering:913.1 ; Crystalline Solids:933.1

ENGINEERING

2-s2.0-85107036280

Scopus

1.Shenzhen Institute of Advanced Electronic Materials,Shenzhen Institutes of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China
2.Shenzhen College of Advanced Technology,University of Chinese Academy of Sciences,Shenzhen,518055,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.School of Materials Science and Engineering,Georgia Institute of Technology,Atlanta,30332,United States

Lei，Zuomin,Tian，Dingkun,Liu，Xuebin,et al. Electrically conductive gradient structure design of thermoplastic polyurethane composite foams for efficient electromagnetic interference shielding and ultra-low microwave reflectivity[J]. CHEMICAL ENGINEERING JOURNAL,2021,424.

Lei，Zuomin.,Tian，Dingkun.,Liu，Xuebin.,Wei，Jianhong.,Rajavel，Krishnamoorthy.,...&Wong，Ching Ping.(2021).Electrically conductive gradient structure design of thermoplastic polyurethane composite foams for efficient electromagnetic interference shielding and ultra-low microwave reflectivity.CHEMICAL ENGINEERING JOURNAL,424.

Lei，Zuomin,et al."Electrically conductive gradient structure design of thermoplastic polyurethane composite foams for efficient electromagnetic interference shielding and ultra-low microwave reflectivity".CHEMICAL ENGINEERING JOURNAL 424(2021).