Dielectric properties of polypropylene containing synthetic and natural organoclays

Clay-containing polymeric nanocomposites and their properties

“…Significant differences in dc and ac were observed [33], [34], [50]. Adding organoclay to PP increased the dc breakdown strength, e.g., with 2 wt% clay loading, from 350 to 380 kV/mm.…”

“…For example, in PNC with 2 to 8 wt% of clay, the flammability was reduced by 50 to 80% (as measured by peak heat release rate) without reduction of physical properties (that take place upon addition of standard flame retardants) or increase of smoke [48], [49]. [33], [34], [50]- [52] Several dielectric tests have been carried out on PP-based PNC, taking into account the short-term electrical aging effects, e.g., breakdown strength (E BD ), dielectric loss at power frequency, electroluminescence emission (EL), space charge distribution, and partial discharge erosion (PDE) depth measurements.…”

Comparative study of synthetic and natural clay filled PP films under surface discharges

“…Summarizing the results of Figure 3, it is obvious that PP+Sy% samples perform better than PP+Nx% samples which may be due to better purity and homogeneity of the synthetic organo clay nanocomposites over natural organo clay nanocomposites [4]. It can be observed that, with increase in the concentration of nanofillers, the maximum PD discharge magnitudes reduce which can be attributed to the nanostructuration of PP matrix or the increased interfacial regions that are resistant to PDs [4].…”

“…Kozako et al [3] investigated the surface degradation of epoxy resin with TiO 2 nanocomposites and observed that the surface degradation of the epoxy resin reduced with the increase in concentration of nanocomposite particles implying an increase in PD resistance. Bulinski et al [4] reported that short term AC breakdown strength of the PP improved by ~ 10% with the introduction of either synthetic or natural organic clay nanocomposites when compared to the unfilled PP.…”

Space charge evolution in polypropylene containing synthetic and natural organoclays

“…Since most of polymer nanocomposites are electrically insulating and the electrical power industry already uses large quantities of polymeric materials as electrical insulation, the efforts to determine whether the PNCs could also posses better dielectric properties and find wider application in the electrical industry area were inevitable. Some of the recently published data suggest that the PNCs do in fact have better electrical breakdown strength, surface and volume resistivity, space charge mitigation characteristics [1][2][3], resistance to partial discharges [4][5][6][7][8], etc.…”