High and Temperature-Independent Dielectric Constant Dielectrics from PVDF-Based Terpolymer and Copolymer Blends
TypeArticles dans des revues avec comité de lecture
Relaxor ferroelectric polymers exhibit high k at their structural phase transition around room temperature. They are particularly attractive as gate dielectric in organic field effect transistor (OFET). Nevertheless, their applications are limited due to their low thermal stability. A polymer blend system with a high and thermally stable dielectric constant is demonstrated by mixing terpolymer poly(vinylidene fluoride-trifluoroethylene-chlorofluorethylene) P(VDF-ter-TrFE-ter-CFE) with copolymer poly(vinylidene fluoride-trifluoroethylene) P(VDF-co-TrFE). PVDF-based blends of various compositions are characterized by dielectric spectroscopy, differential scanning calorimetry (DSC), infrared spectroscopy, small and wide angle X-ray scattering (SAXS and WAXS), and atomic force microscopy (AFM) in order to investigate the relationship between morphology and crystallization of the blend and their dielectric properties. An optimized blend of P(VDF-ter-TrFE-ter-CFE) [55/37/8] and P(VDF-co-TrFE) [46/54] at a ratio of 70/30 is found to exhibit a quasi-constant dielectric constant of 40 ± 2 over a wide temperature range (20–80 °C). Furthermore, electrical characteristics of the PVDF-blend-based gate dielectric OFET show further thermal stability in comparison to OFET based on high-k terpolymer P(VDF-ter-TrFE-ter-CFE) [55/37/8]. An improvement of their drain current stability by up to 60% is demonstrated at 60 °C. These findings enable broader applications of fluoropolymers in organic electronics.
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Thermal behavior of poly(VDF-ter-TrFE-ter-CTFE) copolymers: Influence of CTFE termonomer on the crystal-crystal transitions BARGAIN, François; THUAU, Damien; PANINE, Pierre; HADZIIOANNOU, Georges; DOMINGUES DOS SANTOS, Fabrice; TENCE-GIRAULT, Sylvie (elsevier, 2019)Depending on their CTFE content (from 0 to 10 mol %), poly (VDF-ter-TrFE-ter-CTFE), poly(vinylidene fluoride-ter-trifluoroethylene-ter-chlorotrifluoroethylene) copolymers exhibit ferroelectric (FE) or relaxor ferroelectric ...
KALLITSIS, Konstantinos; SOULESTIN, Thibaut; TENCÉ-GIRAULT, Sylvie; BROCHON, Cyril; CLOUTET, Éric; DOMINGUES-DOS SANTOS, Fabrice; HADZIIOANNOU, Georges P. (American Chemical Society, 2019)Fluorinated electroactive polymers (FEPs) are among the most interesting insulating materials for the production of organic electronic devices. Their ability to tune their response to an applied electric field makes them ...
Simultaneous SAXS-WAXS Experiments on Semi-Crystalline Polymers: Example of PA11 and Its Brill Transition TENCE-GIRAULT, Sylvie; LEBRETON, Sylvie; BUNAU, Oana; DANG, Patrick; BARGAIN, François (2019)This manuscript of the special issue “Microstructural Evolution and Mechanical Behavior of Semi-Crystalline Polymers” aims to show that Small Angle X-ray Scattering (SAXS) and Wide Angle X-ray Scattering (WAXS) experiments ...
Simultaneous SAXS-WAXS experiments on semi-crystalline polymers: Example of PA11 and its brill transition TENCÉ-GIRAULT, Sylvie; LEBRETON, Sylvie; BUNAU, Oana; DANG, Patrick; BARGAIN, François (MDPI, 2019)This manuscript of the special issue “Microstructural Evolution and Mechanical Behavior of Semi-Crystalline Polymers” aims to show that Small Angle X-ray Scattering (SAXS) and Wide Angle X-ray Scattering (WAXS) experiments ...
Microstructure-mechanical properties relationships in vibration welded glass-fiber-reinforced polyamide 66: A high-resolution X-ray microtomography study MOFAKHAMI, Eeva; TENCÉ-GIRAULT, Sylvie; PERRIN, Jonathan; SCHEEL, Mario; GERVAT, Laurent; OVALLE RODAS, Cristian; LAIARINANDRASANA, Lucien; FAYOLLE, Bruno; MIQUELARD-GARNIER, Guillaume (ELSEVIER, 2020)The effect of initial fiber orientation and welding conditions on the mechanical properties and microstructure of 30 wt% glass-fiber-reinforced polyamide 66 was systematically evaluated. For all conditions studied no ...