Fabrication of Piezoelectric Polymer Film.
NATIONAL BUREAU OF STANDARDS WASHINGTON DC POLYMER SCIENCE AND STANDARDS DIV
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High values of pyroelectric and piezoelectric activity in fully electroded films of polyvinylidene fluoride were obtained by conventional non-corona poling at room temperature with sufficiently high fields. The avoidance of breakdown while obtaining high activity requires an understanding of the time dependence of both breakdown and activity. Time-to-breakdown as a function of field, and room temperature pyroelectric activity 7-14 days after poling at 23-12 deg C as a function of poling time and field were obtained for 25-micrometer biaxially stretched films with evaporated aluminum electrodes. The highest activities were obtained by poling at the highest fields and poling to breakdown. A pyroelectric activity of 36micro-CK sq m was measured two weeks after poling. The highest activity obtained with no apparent breakdown 31micro-CK sq m was measured a week after poling. These values are comparable with the highest that have been reported for this material using any poling temperature or using corona poling.
- Electricity and Magnetism