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Influence of radiation structures on positive-temperature-coefficient and negative-temperature-coefficient effects of irradiated low-density polyethylene/carbon black composites

Authors

  • Hongfeng Xie,

    Corresponding author
    1. Key Laboratory for Mesoscopic Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China
    • Key Laboratory for Mesoscopic Chemistry of the Ministry of Education, College of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, People's Republic of China
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  • Lisong Dong,

    1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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  • Jiazhen Sun

    1. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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Abstract

The electrical-resistivity/temperature behaviors of low-density polyethylene (LDPE)/carbon black (CB) composites irradiated with 60Co γ rays were studied. The experimental results showed that the irradiated composites could be separated into insoluble crosslinking networks with CB (gel) and soluble components (sol) by solvent-extraction techniques. When the sol of an irradiated LDPE/CB composite was extracted, the electrical conductivity of the system increased. The positive-temperature-coefficient (PTC) and negative-temperature-coefficient (NTC) intensities of the gels of the irradiated composites became extremely small and independent of the radiation dose. The sols and gels of the irradiated LDPE/CB composites, which had different thermal behaviors, played important roles in the appearances of the PTC and NTC effects. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 700–704, 2005

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