Electrical and thermal properties of kraft paper reinforced with montmorillonite

Kraft‐montmorillonite composites (K‐MMT) with different weight percent of MMT and different stirring time were prepared successfully. The electrical properties and thermal stability of K‐MMT were investigated. The breakdown voltage of K‐MMT (9 wt % MMT, stirring 12 min) was increased to 60 kV/mm from 50.3 kV/mm of blank Kraft. With the increase of MMT, the relative permittivity had a corresponding reduction. The relative permittivity was in the range of 2.29–2.42 at 50 Hz. The thermal stability of K‐MMT, Kraft, and MMT were also measured.