Keyword: «electrical conductivity»

Modeling of an electrothermal process in temperature field estimating is considered through the example of one-dimensional thermal conductivity. The use of this technique is justified by the need to consider initial and boundary conditions if mathematical tools are used. This circumstance complicates the process of obtaining analytical solutions and in some cases makes it impossible. The presented type of heat processes modeling is based on similarity of equations which describe thermal and electrical processes thus allowing us to recalculate the potential distribution obtained in modeling into the actual value of retaining walls temperature field.

The effect of mild oxidation of multi-walled carbon nanotubes (MWCNTs) on the electrophysical properties of composites based on linear low-density polyethylene (LLDPE) was studied. Oxidation with 30% hydrogen peroxide cleans the MWCNT surface from amorphous carbon, enhances their dispersibility in the polymer matrix, and alters the conductivity type of the nanotubes. As a result, the resistivity of individual MWCNTs increases, the resistivity of MWCNT ensembles rises up to 25 times, and the volume resistivity of the polymer composites increases up to 81 times compared to those containing pristine MWCNTs.