Piezo and Pyroelectric Properties of Electrets.
NATIONAL BUREAU OF STANDARDS WASHINGTON DC POLYMER SCIENCE AND STANDARDS DIV
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Electrets with piezoelectric and pyroelectric properties can be made from thin polymer films which have the desirable properties of being flexible, strong, and light weight. The properties of electrets composed or oriented molecular dipoles in both amorphous and semicrystalline polymers are compared with monopolar electrets formed by frozen-in real charge. Models and concepts are presented which allow piezoelectric and pyroelectric response to be predicted from material properties. a two-site model of dipole alignment involving cooperativity leads to predictions for ferroelectric switching in polymers with a polar crystal form. Experimental results are reviewed and compared with predictions from the model. Author
- Electricity and Magnetism