https://doi.org/10.1351/goldbook.08848
Minimal volume fraction of functionally active small particles evenly dispersed in a non-active matrix, at which the long-range (infinite) functional connectivity in the system is achieved.
Notes:
- A desired transport through the composite material is not possible below the percolation threshold. Percolation threshold is about \(\pu{0.3}\) to \(\pu{0.35}\) (by volume) for composites with nearly spherical disperse particles while it can be even below \(\pu{0.10}\) for composites with short fibers, depending on the fibers’ aspect ratio (the length to diameter ratio).
- Electrically conducting polymer composites composed of carbon black microparticles dispersed in a rubbery matrix are transposed in the electrically conducting state above percolation threshold.