THE PIEZOELECTRIC EFFECT AND STORED POLARIZATION IN CORONA-CHARGED ABS FILMS

The piezoelectric coefficient osl of poly-(aclylonitrile-co-butadiene- co-styrene) (ABS) terpolymer films has been measured as a function of various poling and stretching conditions. d(31) congruent to 1.75 pC N -1 has been measured in ABS films for a poling field of about 55 MV m( -1), poling temperature 90 degrees C and stretching ratio 4. The store d polarization P-r in piezo ABS films has been estimated using thermal ly stimulated depolarization current (TSC) experiments. The contributi ons of the dimensional effect and the polarization to the piezoelectri city in the ABS films have been determined. Cooperative dipolar behavi our is believed to be involved in the stored polarization.