Journal
COMPOSITES SCIENCE AND TECHNOLOGY
Volume 159, Issue -, Pages 152-161Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2018.02.041
Keywords
Polymer-matrix composites (PMCs); Electrical properties; Interface
Categories
Funding
- Opening Project of State Key Laboratory of Polymer Materials Engineering (Sichuan University) [sklpme2017-4-05]
- Fundamental Research Funds for the Central Universities [XDJK2017B018, XDJK2017D051]
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High-efficiently conductive networks have been well demonstrated to improve electrical properties of conductive polymer composites (CPCs). Here, a facile approach was introduced to control distribution of multi-walled carbon nanotubes (MWCNTs) in isotactic polypropyleneipoly(ethylene-co-1-octene) blends (iPP/POE). The POE first melt-crosslinked by the addition of dicumyl peroxide, pulverized into small particles (40-60 meshes), then coated with iPP/MWCNTs composites, and finally compression molded to achieve the segregated iPP/POE/MWCNTs composites with MWCNTs confinedly dispersing in continuous iPP phase. This segregated structure could easily construct high-efficiently conductive networks, resulting in a low percolation threshold of 0.24 vol.%, high-performance electrical conductivity, and electromagnetic interference shielding effectiveness (EMI SE). For example, the EMI SE of similar to 25 dB could be achieved in the segregated nanocomposites with 3.0 vol.% MWCNTs (thickness 1.2 mm) which reached the commercial requirement. Furthermore, the segregated samples also exhibited a relatively linear negative temperature coefficient (NTC) effect through wide temperature ranges of 45-120 degrees C and 150-190 degrees C because of anisotropic volume expansion effect caused by the segregated structure. (C) 2018 Elsevier Ltd. All rights reserved.
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