Silicone resin electrets

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Abstract
Corona charged electrets (both negative and positive) and thermoelectrets have been formed with Dow Corning silicone resin. Thermally stimulated discharge (TSD) measurements on charge and current and charge‐decay measurements at ambient temperature have been carried out on each type of electret. The charge retention of the negative‐corona‐charged samples compares favorably with polypropylene. A theoretical analysis of the current TSD yielded lifetime estimates of many months. The thermoelectret shows promise of being even longer lived. Further work is needed to determined the optimum thermoelectret polarization and curing temperatures and times. A detailed study of the effects of humidity should also be made.

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