Piezo- and pyroelectric properties of dehydrofluorinated PVDF films

Author

Künstler, Wolfgang

Author_Institution

Potsdam Univ., Germany

fYear

1994

fDate

7-9 Sep 1994

Firstpage

640

Lastpage

643

Abstract

PVDF was effectively dehydrofluorinated by the reaction with hot alkali-DMSO solution. PVDF degrades to products containing c=c, c=c, and c=0 groups as revealed by the corresponding bands in the IR spectrum. Because of the formation of conjugated c=c double bonds in the polymer chain, films of degraded PVDF become darker. Films have been produced by casting onto a glass plate. These cast films were stretched and poled. The results of the measurements of the piezoelectric strain coefficient d₃₁ and of the pyroelectric coefficient p₃ are given in comparison with undegraded films. Moderately pyroelectric coefficients of dehydrofluorinated PVDF films and their enhanced absorbance makes them attractive for potential applications in fast pyroelectric sensors

Keywords

dielectric polarisation; electrets; piezoelectric thin films; piezoelectricity; polymer films; pyroelectric detectors; pyroelectricity; IR spectrum; PVDF films; cast films; conjugated double bonds; dehydrofluorination; electrets; fast pyroelectric sensors; hot alkali-DMSO solution; piezoelectric strain coefficient; poling; pyroelectric coefficient; Chemical elements; Chemical sensors; Electrodes; Electromagnetic wave absorption; Glass; Piezoelectric films; Polymer films; Pyroelectricity; Strain measurement; Thermal degradation;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrets, 1994. (ISE 8), 8th International Symposium on

Conference_Location

Paris

Print_ISBN

0-7803-1940-0

Type

conf

DOI

10.1109/ISE.1994.514844

Filename

514844