Pyro- and piezoelectricity of polyvinylidenefluoride in dependence on the drawing conditions

• Published in: 1985 5th International Symposium on Electrets (ISE 5) pp. 918 - 923
• Main Authors: Elling, Burkhard, Geiss, Detlev, Konstler, Wolfgang, Stark, Wolfgang, Danz, Rudi
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-09-1985
• Subjects: Correlation; Piezoelectric polarization; Polymers; Temperature measurement; Thermal expansion
• DOI: 10.1109/ISE.1985.7341595

The pyro- and piezoelectric coefficients p 3 and d 31 , respectively, and the remanent polarization P of PVDF films drawn uniaxially and biaxially under different conditions (draw ratio, temperature) were determined in dependence on the −1 poling field up to 430 MVm −1 . While the saturation value of the remanent polarization showed no essential changes, the pyro- and piezoelectric coefficients proved to depend strongly on the drawing conditions, At the saturation value of polarization (P r = 85 mCm −2 ) the highest values of the pyro- and piezoelectric coefficients (p 3 = 45, uCm −2 K −1 and d 31 = 35 pCN −1 ) were obtained with samples drawn uniaxially at 170 °C. Samples containing chains in transconformation only show strong correlation between pyro- and piezoelectric coefficients and the remanent polarization and dipole orientation, respectively.