Abstract
Electrical characteristics of crystalline polymer composites filled with nano-sized carbon black particle were studied. The developed composite system exhibited a typical positive temperature coefficient resistance (PTCR) characteristic, where the electrical resistance sharply increased at a specific temperature. The PTCR effect was sometimes followed by a negative temperature coefficient resistance (NTCR) feature with temperature, which seemingly caused by the coagulation of nano-sized carbon black particles in the excessive quantity. The PTCR temperature was controlled by the carbon black content and the external voltage. The change of electric conductivity was shown as a function of carbon black content, and the resistance was constant when the carbon black content was over 20 wt%. The room-temperature resistance was maintained by a repeated heating and cooling. The excellent PTCR characteristic was demonstrated by the low resistance in the initial stage and the instantaneous heating capability.
| Original language | English |
|---|---|
| Pages (from-to) | 367-374 |
| Number of pages | 8 |
| Journal | Polymer (Korea) |
| Volume | 26 |
| Issue number | 3 |
| State | Published - May 2002 |
Keywords
- Conducting polymer
- Electrical resistance
- Nano-sized carbon black
- Positive temperature coefficient resistance (PTCR)
- Thermoplastic polymer