Method to double the piezo-and pyroelectric of polyvinylidine fl

Details Method to double the piezo-and pyroelectric of polyvinylidine fl Method to double the piezo-and pyroelectric of polyvinylidine fl

1991-11-13

1993-10-19

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

264 24, 2642884, 4251748E, B29C 3500

Patent

active

052542963

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 (d.sub.31) of about 30-35 pC/N and a maximum pyroelectric constants (p) of about 3.5 nC/cm.sup.2 K. It has now been found that the piezoelectric constant d.sub.31 and pyroelectric constant p of these films can be increased up to about 60 pC/N and 6 nC/cm.sup.2 K respectively when they are subjected to simultaneously stretching and corona poling with a poling field E.sub.p =0.55MV/cm, a stretching ratio S.R.=4.5X and a poling temperature T.sub.p =80.degree. C.

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