Conductive polymer blends filled with carbon black: Positive temperature coefficient behavior

Authors

  • Gang Yu,

    1. Materials Science Institute Zhongshan University Guangzhou 510275, P. R. China
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  • Ming Qiu Zhang,

    Corresponding author
    1. Materials Science Institute Zhongshan University Guangzhou 510275, P. R. China
    • Materials Science Institute Zhongshan University Guangzhou 510275, P. R. China
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  • Han Min Zeng,

    1. Laboratory of Polymeric Composite and Functional Materials The State Educational Commission of China Zhongshan University Guangzhou 510275, P. R. China
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  • Yan Hui Hou,

    1. Laboratory of Polymeric Composite and Functional Materials The State Educational Commission of China Zhongshan University Guangzhou 510275, P. R. China
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  • Hai Bo Zhang

    1. Laboratory of Polymeric Composite and Functional Materials The State Educational Commission of China Zhongshan University Guangzhou 510275, P. R. China
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Abstract

Electrical conductivity and positive temperature coefficient (PTC) behavior of carbon black (CB) filled incompatible polyblends of ethylene-vinyl acetate copolymer/low density polyethylene (EVA/LDPE) were investigated. In comparison with single polymer systems, more possibilities for tailoring composite performance were brought about with the employment of polymer blends as matrix resins in conductive composites. Based on the concepts of double percolation and two-step percolation, PTC-type composites with balanced performance, improved processability, and reproducibility can be made. Thermodynamical and kinetic factors including interfacial energy, melt viscosity, blending ratio, melt mixing time, sequence of blending as well as CB concentration were shown to be closely related to the ultimate properties obtained.

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