Developing sensors derived from electrically conductive polymer composites
has been attempted. The matrices used were: HDPE, PS, PP and HDPE/PP blend.
The filler was carbon black of particle size 10 to 110 nanometers.
Electrical conductivity, mechanical strength, Vicat softening temperature
and melt rheology were investigated.
The lowest percolation threshold was achieved at 2 wt% of carbon black,
which resulted in electrical resistance of 10exp7 [Ohm*m]. Along with the
filler volume the Vicat softening temperature increased at every polymer
matrix for a few centigrades. At the highest filler content Young modulus of
composites was even four times higher, whereas elongation at break decreased
substantially if compare to the net polymers. Melt viscosity increased with
carbon black content, making composites hardly processable at high filler
loadings.

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