Effect of incorporating ethylene-ethylacrylate copolymer on the positive temperature coefficient characteristics of carbon black filled HDPE systems

Authors

  • Gun Joo Lee,

    1. Division of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
    2. Department of Textile and Polymer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
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  • Kyung Do Suh,

    1. Division of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
    2. Department of Textile and Polymer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
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  • Seung Soon Im

    Corresponding author
    1. Division of Chemical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
    2. Department of Textile and Polymer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
    • Department of Textile and Polymer Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
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Abstract

In order to study the effect of introducing ethylene-ethylacrylate copolymer (EEA) in carbon black-HDPE composite systems, two HDPE-EEA composites prepared by pre-blending and masterbatch-blending processes were compared with HDPE and EEA composites in terms of positive temperature coefficient (PTC) characteristics and percolation threshold. The percolation threshold of masterbatch-blended composites occurred at the lowest carbon black concentration among four kinds of composites. The conduction path in the masterbatch-blended composite is effectively formed as a result of the localization of carbon black distribution predominantly in the EEA phase, resulting in an increase of conductivity. Ipeak values, the resistivity ratio of the peak to 25°C, of two blend composites were lower than those of HDPE composites. The I85 values, the resistivity ratio of 85°C to 25°C, of masterbatch-blended composites were higher than those of pre-blended as well as HDPE composites. It is evident that since most carbon black is dispersed in the EEA phase of the masterbatch-blended composites, the conduction networks are mainly broken by the crystal melting of EEA before the temperature reaches the crystal melting temperature of HDPE.

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