Poled PVDF piezoelectric film without electrode.
Three Thickness avaiable: 3 um, 6 um, 8 um, 25 um, 40 um,
d33 >15 pC/N. d31 and d32 >12 pC/N as this film is biaxially oriented. [values may be related to film thickness]
Size of 100 mm x 100 mm
For piezo sensors. loudspeakers.
Higher d33 can be achieved by higher poling voltage, but at lower yield.
Lei Zhu, Yanfei Huang, et al Nature Communications "Enhanced piezoelectricity from highly polarizable oriented amorphous fractions in biaxially oriented poly(vinylidene fluoride) with pure β crystals" http://www.nature.com/articles/s41467-020-20662-7