Influence of the Amount of Silane Coupling Agent on the Dielectric Properties of AlN/Polypropylene Nanocomposites

Abstract

In this work, four loading amounts of trimethoxy (octyl) silane (C8-M) were used in preparing C8-M treated AlN/polypropylene nanocomposites. Although the thermal gravimetric analysis shows a significant difference in the amount of C8-M grafted on the AlN surface, and a saturation point can be reached as the amount of C8-M added increases, the AC breakdown strengths of composites present virtually identical results. Similar behaviours can be observed in the real and imaginary permittivity from 0.01 Hz to 100 kHz, although the upturns of the imaginary permittivity at low frequency are observed increasing with the amount of C8-M used. Seemingly contradictory to a previously reported work on epoxy with nanosilica, AlN/polypropylene is largely unaffected by the amount of the silane coupling agent applied during the surface treatment.

Polypropylene‐based nanocomposites for HVDC cable insulation

“…Wang et al. [76] selected different amounts of trimethoxy (octyl) silanes based on an estimation method for the modification of AlN nanofiller. Their results suggested that the amount of silane has little effect on the dielectric breakdown strength of PP/AlN nanocomposites.…”

“…On the contrary, excessive amount of silane can undergo a self-condensation reaction, which could degrade the electrical properties of nanocomposite systems. Wang et al [76] selected different amounts of trimethoxy (octyl) silanes based on an estimation method for the modification of AlN nanofiller. Their results suggested that the amount of silane has little effect on the dielectric breakdown strength of PP/AlN nanocomposites.…”

Surface Functionalization and Humidity on Charge Transport in PP/TiO2 and PP/MgO Nanocomposites

“…Nano powder was added to 0.1 g/mL of dry toluene, and the nanofiller/dry toluene mixture was sonicated for 1 h. The mixture was poured into an evaporation flask, and then 0.2 mL of SCA was slowly added. This quantity was determined to prevent the saturation reaction point [11]. The resulting mixture underwent stirring using a magnetic stirrer on a hotplate and was heated to reflux at the boiling point of toluene for 4 h. The obtained slurry was washed three times with 100 mL of fresh toluene and centrifuged at 8000 rpm to remove any excess SCA.…”