Ground tire rubber composites with hybrid conductive network for efficiency electromagnetic shielding and low reflection
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An efficiency electromagnetic interference (EMI) shielding composite with low microwave reflection was fabricated by introducing nickel coated ultrahigh molecular weight polyethylene particles (UHMWPE@Ni) into ground tire rubber (GTR) matrix. Chain-like carbon black (CB) aggregates in GTR domains connected discontinuous Ni layers to form a hybrid conductive network. The remarkable EMI shielding effectiveness (SE) and low reflection characteristics of GTR/UHMWPE@Ni composites were attributed to the well-connected Ni–CB hybrid conductive network with both magnetic hysteresis loss and electrical loss, and the multi-interfaces structure induced by the selectively distributed Ni layer at the interface between UHMWPE and GTR. With only 1.04 vol% Ni content, the EMI SE of GTR/UHMWPE@Ni composite reached 47.3 dB in X band. Because of the synergistic effect of the Ni–CB hybrid network, the power coefficient of reflectivity (R) of the composite was as low as 0.58. The result indicated that our work provided a feasible strategy to fabricate efficient electromagnetic shielding materials with low microwave reflection.
The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Grant No. 21704070), Natural Science Foundation of Shanxi Province (Grant Nos. 201701D221089; 201801D121109), and the Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) (Grant Nos. sklpme2017409; sklpme2018-4-35). We are also grateful for the support from Shanxi Province 1331 Project Key Innovation Team of Polymeric Functional New Materials, Shanxi Province Innovative Disciplinary Group of New Materials Industry, and Shanxi Province Patent Conversion Project (Grant No. 20171007).
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