As the next step, we computed the apparent resistivity values for the four-electrode Schlumberger array as an average value of the apparent resistivities measured by the forward and reversed pole-dipole.
Measured apparent resistivities were inverted using the software Res2dInv by M.
In the past, typical carbon filled materials contained 10 - 40% carbon filler to obtain volume resistivities
between 10 - [10.
Among the four types of curves, Type I and Type II curves show similar shape of field curves with layer resistivities
decreasing with depth such that [rho]1>[rho]2>[rho]3.
Figure 1 depicts the log resistivities
of the 10 wt% N660 and 10 wt% V-XC72-filled ETFE composites as a function of strain.
Because of the limitations of the electrometer, it was not possible to measure resistivities
The latter is characterized by PTC intensity, generally defined as the ratio of resistivities
at the switching temperature and room temperature [1-5].
5 and 10 wt%, the composites exhibit high room temperature resistivities
and high PTC intensities followed by a sharp NTC effect.
The 55HIPS/45LLDPE extrudates become nonconductive at intermediate shear rates, and generally depict higher resistivities
than their two counterparts.
Interesting low electrical resistivities
were measured for the CB containing PP/Ny blends.
However, the resistivities
of particulate composites prepared with composite fillers of different sizes show the same field dependence, as shown in Fig.
Common polymers are electrically insulating with volume resistivities