The Strain Dependent Dielectric Behaviour of Carbon Black Filled Elastomers
Menglong Huang did his PhD in Queen Mary University of London, mainly focusing on the strain dependent dielectric behaviour of carbon black (CB) filled elastomers. He designed a new approach to study the dielectric/mechanical property of elastomers simultaneously. The dielectric permittivity versus strain behaviour follows a very similar softening effect to the mechanical Payne and Mullins effects albeit to a much greater extent and at a different level of strain. This allows an independent measure to be made of changes in the filler network structure with strain and this facilitates a better understanding of the actual network structures that might exist. This dielectric/mechanical relationship also presents an opportunity to develop novel strain sensors. The prototype capacitance strain sensors made using a carbon black filled NR exhibited a much larger sensitivity when compared to other recently reported sensors.