Method to double the piezo - and pyroelectric constants of...

Details Method to double the piezo - and pyroelectric constants of... Method to double the piezo - and pyroelectric constants of...

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29

C

204/96.2

B29C 59/10 (2006.01) B29C 55/00 (2006.01) B29C 55/02 (2006.01) B29C 71/04 (2006.01) C08J 3/28 (2006.01) H01L 37/02 (2006.01) H01L 41/26 (2006.01)

Patent

CA 2032015

ABSTRACT Polyvinylidene fluoride (PVDF) films and co-polymers thereof possess the highest values of piezoelectric and pyroelectric constants of any known polymer. These films, up to present, have been first subjected to stretching and then to a high electric field (or corona charge) at an elevated temperature to provide a maximum piezoelectric constants (d31) of about 30-35 pC/N and a maximum pyroelectric constants (p) of about 3.5 nC/cm2K. It has now been found that the piezoelectric constant and pyroelectric constant p of these films can be increased up to about 60 pC/N and 6 nC/cmZ K respectively when they are subjected to simultaneously stretching and corona poling with a poling field Ep = O.55MV/cm, a stretching ratio S.R. = 4.5X and a poling temperature Tp = 80 C.

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