Fabrication of Segregated Polyethylene/Graphite-Carbon Nanotubes Composite for Electromagnetic Interference Shielding

doi:10.19491/j.issn.1001-9278.2019.10.004

Abstract

Abstract: A series of polyethylene (PE-HD)/ultrahigh-molecular-weight polyethylene (PE-UHMW)/graphite-carbon nanotubes (G-CNTs) composite materials with a segregated structure were fabricated by means of a solution-mechanical mixing and hot-compression method. In such a segregated structure, the G-CNTs hybrid was distributed in the PE-HD matrix to form a conductive PE-HD/G-CNT layer, which could be selectively localized on the boundary of PE-UHMW granules. The resultant composite exhibited excellent electrical and mechanical properties. The segregated structure endowed the composite with a very low percolation threshold of 0.23 vol % at the graphite/CNTs weight ratio=1/3. The composite containing only 4 wt % of filler achieved an electrical conductivity of 0.92 S/m, and its tensile strength, Young's modulus, and elongation at break reached 27.1 MPa, 758.5 MPa and 138.7 %, respectively. Additionally, the electrical and mechanical performance of the composites could be controlled by adjusting the weight ratio of low-cost graphite and highly conductive CNTs. This is of greatly significant for the practical applications.

Key words: segregated structure, graphite, carbon nanotube, ultrahigh molecular weight polyethy lene, high density polyethylene

CLC Number:

YI Xin, ZHOU Hualong, ZHANG Yong, JIANG Xing, YAN Dingxiang. Fabrication of Segregated Polyethylene/Graphite-Carbon Nanotubes Composite for Electromagnetic Interference Shielding[J]. China Plastics, 2019, 33(10): 17-22.

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