Cellular polymers showing interesting quasi-piezoelectric properties, upon charging under electrical field, are being developed for a few years. They are manufactured in a way to generate a high density of internal cavities, which play a major role in the charging process. Therefore, investigation of charging mechanisms is fundamental to reach optimization of electret and quasi-piezoelectric properties. This paper investigates efficiency of contact charging of cellular polypropylene (PP) as a function of a manufacturing treatment, i.e. gas expansion, that increases the mean size of internal cavities. Testing techniques are based on partial discharge and space charge measurements. A model for the charging process is presented, with the purpose of providing explanations to the different behavior of cellular and cellular expanded PP.
Effect of gas expansion on charging behavior of piezoelectric cellular PP / G. C. Montanari; G. Mazzanti; F. Ciani; M. Paajanen. - STAMPA. - (2004), pp. 153-157. (Intervento presentato al convegno 2004 IEEE Conference on Electrical Insulation and Dielectric Phenomena (IEEE CEIDP 2004) tenutosi a Boulder, Colorado (USA) nel 17-20 Ottobre 2004).
Effect of gas expansion on charging behavior of piezoelectric cellular PP
MONTANARI, GIAN CARLO;MAZZANTI, GIOVANNI;CIANI, FABIO;
2004
Abstract
Cellular polymers showing interesting quasi-piezoelectric properties, upon charging under electrical field, are being developed for a few years. They are manufactured in a way to generate a high density of internal cavities, which play a major role in the charging process. Therefore, investigation of charging mechanisms is fundamental to reach optimization of electret and quasi-piezoelectric properties. This paper investigates efficiency of contact charging of cellular polypropylene (PP) as a function of a manufacturing treatment, i.e. gas expansion, that increases the mean size of internal cavities. Testing techniques are based on partial discharge and space charge measurements. A model for the charging process is presented, with the purpose of providing explanations to the different behavior of cellular and cellular expanded PP.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
