Space charge polarisation

TSD dipole relaxation processes are in general easier detectable than space charge depolarisation effects. For nonpolar polymers, however, the TSD effect is depending on the space charge polarisation possibilities. 

The sample diameter /thickness ratio (8.0 for this system) proved to be not high enough, however, to perform measurements on non-polar polymers where the TSD effects depend on the much weaker space charge polarisation effects. In such cases the TSD and the expansion coefficient measurements were performed using standard equipment with a TSD sample diameter/thickness ratio of about 400, as decribed in chapter 5.4.3. 

Space-charge polarisation (SCP) is a widely encountered component of the electrical behavior of solids and liquids. In order to define it unambiguously, it is desirable to start with the more general phenomenon of electric polarisation. 

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