Abstract
The influence of the corona-charging process on the piezoelectrictransducer coefficient d33 of a cellular electret film has been investigated.An increased corona voltage can be considered as a way to enhance the chargedensity and thus also the resulting piezoelectric effect. Highercorona-charging voltages are possible with increased ambient pressure or insuitable dielectric gases. The effect of the gas inside the voids has alsobeen studied. Enhanced transducer coefficients were obtained by coronacharging in N2 or N2O gas atmospheres at 100-450 or 100-140 kPapressures, respectively. The highest transducer coefficients of about790 pCN-1 were obtained when N2 gas was filled into the voids of a cellularpolymer film by means of consecutive vacuum and high-pressure treatments at295 or 313 K.
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