Macromolecular Research

  • 제12권1호
  • /
  • Pages.53-62
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  • 2004
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  • 1598-5032(pISSN)
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  • 2092-7673(eISSN)
한국고분자학회 (The Polymer Society of Korea)
권호 표지

PTC Behavior of Polymer Composites Containing Ionomers upon Electron Beam Irradiation

  • Kim, Jong-Hawk (PTC Division, Shinwha Intertek Corp.,) ;
  • Cho, Hyun-Nam (Optoelectronic Materials Research Center, Korea Institute of Science and Technology) ;
  • Kim, Seong-Hun (Department of Fiber ＆ Polymer Engineering, Center for Advanced Functional Polymers, Hanyang University) ;
  • Kim, Jun-Young (Department of Fiber ＆ Polymer Engineering, Center for Advanced Functional Polymers, Hanyang University)
  • 발행 : 2004.02.01
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초록

We have prepared polymer composites of low-density polyethylene (LDPE) and ionomers (Surlyn 8940) containing polar segments and metal ions by melt blending with carbon black (CB) as a conductive filler. The resistivity and positive temperature coefficient (PTC) of the ionomer/LDPE/CB composites were investigated with respect to the CB content. The ionomer content has an effect on the resistivity and percolation threshold of the polymer composites; the percolation curve exhibits a plateau at low CB content. The PTC intensity of the crosslinked ionomer/LDPE/CB composite decreased slightly at low ionomer content, and increased significantly above a critical concentration of the ionomer. Irradiation-induced crosslinking could increase the PTC intensity and decrease the NTC effect of the polymer composites. The minimum switching current (Ι$\sub$trip/) of the polymer composites decreased with temperature; the ratio of Ι$\sub$trip/ for the ionomer/LDPE/CB composite decreased to a greater extent than that of the LDPE/CB composite. The average temperature coefficient of resistance (${\alpha}$$\sub$T/) for the polymer composites increased in the low-temperature region.

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