Thermally switchable dielectrics

DWPI Title: Thermally switchable dielectric for capacitor for e.g. electronic device and hybrid vehicle, comprises non-conjugated precursor polymer having leaving group containing halogen, which is eliminated by heating to specified temperature
Abstract: Precursor polymers to conjugated polymers, such as poly(phenylene vinylene), poly(poly(thiophene vinylene), poly(aniline vinylene), and poly(pyrrole vinylene), can be used as thermally switchable capacitor dielectrics that fail at a specific temperature due to the non-conjugated precursor polymer irreversibly switching from an insulator to the conjugated polymer, which serves as a bleed resistor. The precursor polymer is a good dielectric until it reaches a specific temperature determined by the stability of the leaving groups. Conjugation of the polymer backbone at high temperature effectively disables the capacitor, providing a 'built-in' safety mechanism for electronic devices.
Use: Thermally switchable dielectric is used for capacitor (claimed) for electronic device, electric vehicle and hybrid vehicle.
Advantage: The capacitor containing the thermally switchable dielectric has excellent safety and storage stability.
Novelty: A thermally switchable dielectric comprises a non-conjugated precursor polymer having a leaving group which is eliminated by heating to a specified temperature, so that the non-conjugated precursor polymer from an insulator is converted to an electroconductive conjugated polymer. The leaving group contains halogen.
Filed: 2/24/2011
Application Number: US13034535A
Tech ID: SD 11363.1
This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.
Data from Derwent World Patents Index, provided by Clarivate
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