Method for manufacturing a pyroelectric mixture

Details Method for manufacturing a pyroelectric mixture Method for manufacturing a pyroelectric mixture

G - Physics

01

J

G01J 5/10 (2006.01) H01L 37/02 (2006.01) H01L 41/193 (2006.01) H01L 41/26 (2006.01)

Patent

CA 2193563

The present invention relates to a method for manufacturing a pyroelectric mixture, in particular for pyroelectric and piezoelectric elements. The method that is used to do this includes the following steps: mixing at least two compounds in a predetermined mixing ratio, one compound containing a polymerizable, preferably achiral, liquid crystalline monomer, the other compound being advantageously an achiral liquid crystal polymer or copolymer. Each compound contains substituents that form hydrogen bridges. The mixture is heated above the specific glass point. Next, an electrical field is applied, with the help of which the polymerizable monomer polymerizes and the mixture is poled. With the electrical field applied, the mixture is cooled below the glass point. The pyroelectric coefficient of the mixture that can be achieved lies in the order of magnitude of pyroelectric elements of the PVDF type. Its quality factor is, however, higher than that of the known elements of the PVDF type.

La présente invention porte sur une méthode de fabrication industrielle d'un mélange pyroélectrique, en particulier d'éléments pyroélectriques et piézoélectriques. La méthode utilisée comprend les étapes suivantes : mélange d'au moins deux composés dans des proportions prédéterminées, l'un d'eux contenant un monomère cristallin liquide polymérisable, achiral de préférence, l'autre étant avantageusement un polymère ou un copolymère cristallin liquide achiral. Chacun des composés porte des substituants formant des ponts hydrogène. Le mélange est chauffé au-delà du point de vitrification spécifique. Ensuite, un champ électrique est appliqué qui aide le monomère à polymériser, et le mélange est polarisé. Pendant que le champ électrique est maintenu, le mélange est refroidi jusqu'à une température inférieure au point de vitrification. Le coefficient pyroélectrique du mélange obtenable est de l'ordre de grandeur de celui des éléments pyroélectriques du type PVDF. Son facteur de qualité est toutefois supérieur à ceux des éléments connus de type PVDF.

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