A5081830387- Advanced Sensor and Energy Harvesting Materials
- Dielectric materials and actuators
- Synthesis and properties of polymers
- Ferroelectric and Piezoelectric Materials
- Conducting polymers and applications
- Silicone and Siloxane Chemistry
- Metal and Thin Film Mechanics
- Semiconductor materials and devices
- Copper Interconnects and Reliability
- Electrospun Nanofibers in Biomedical Applications
- Polymer Nanocomposite Synthesis and Irradiation
Arkema (France)
2017-2021
École Nationale Supérieure de Chimie de Montpellier
2015-2017
Centre National de la Recherche Scientifique
2015-2017
Institut Charles Gerhardt Montpellier
2015-2017
Architecture et Fonction des Macromolécules Biologiques
2016
A new family of electroactive fluorinated terpolymers vinylidene fluoride (VDF), trifluoroethylene (TrFE) and 3,3,3-trifluoropropene (TFP) is presented. Statistical poly(VDF-ter-TrFE-ter-TFP) with a VDF/TrFE molar ratio ca. 65/35 TFP composition ranging from 0 to 10 mol % were prepared in high yields by free radical terpolymerization dimethyl carbonate (DMC), initiated symmetrical peroxydicarbonate initiator. The choice as termonomer was driven the potential property CF3 side groups limit...
Relaxor ferroelectric (RFE) polymers are attractive for various electrical applications such as electrostrictive actuation, electromechanical sensors, electric energy storage, and electrocaloric cooling because of their high dielectric constants low hysteresis loss. Current state-of-the-art RFE include poly(vinylidene fluoride-co-trifluoroethylene) [P(VDF–TrFE)]-based random copolymers terpolymers. However, the costs due to a safety concern TrFE make near-term commercialization difficult. It...
Abstract Electrocaloric refrigeration is one of the most promising environmentally‐friendly technologies to replace current cooling platforms—if a notable electrocaloric effect (ECE) realized around room temperature where highest need is. Here, straight‐forward, one‐pot chemical modification P(VDF‐ter‐TrFE‐ter‐CTFE) reported through controlled introduction small fractions double bonds within backbone that, very uniquely, decreases lamellar crystalline thickness while, simultaneously,...
Relaxor ferroelectric (RFE) polymers exhibiting narrow hysteresis loops are attractive for a broad range of potential applications such as electric energy storage, artificial muscles, electrocaloric cooling, and printable electronics. However, current state-of-the-art RFE primarily poly(vinylidene fluoride-co-trifluoroethylene-co-X) [P(VDF-TrFE-X)] random terpolymers with X being 1,1-chlorofluoroethylene (CFE) or chlorotrifluoroethylene (CTFE). Potential dehydrochlorination at elevated...
Abstract 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, applications limited due to low thermal stability. A polymer blend system with a and thermally stable constant is demonstrated by mixing terpolymer poly(vinylidene fluoride‐trifluoroethylene‐chlorofluorethylene) P(VDF‐ ter ‐TrFE‐ ‐CFE) copolymer...
Modified fluorinated electroactive poly(VDF-<italic>co</italic>-TrFE) copolymers with improved adhesion properties, on glass or metal substrates, are presented.
trans-1,3,3,3-Tetrafluoropropene (1234ze) was copolymerized under free radical conditions with vinylidene fluoride (VDF) and trifluoroethylene (TrFE), for the first time, leading to statistical poly(VDF-ter-TrFE-ter-1234ze) electroactive terpolymers. The reactivity ratios of three comonomer couples were determined (rVDF = 0.77; rTrFE 0.32), 1.67; r1234ze 0.00), (rTrFE 7.56; at 48 °C, using nonlinear fitting Mayo–Lewis method. 1234ze shown be regularly incorporated in terpolymer chains over...
In the search for fluorinated polymers with new electroactive properties, radical polymerization of vinylidene fluoride (VDF), trifluoroethylene (TrFE), and trans-1,3,3,3-tetrafluoropropene (1234ze) was achieved. The crystalline organization properties semicrystalline poly(VDF-ter-TrFE-ter-1234ze) terpolymer films 1234ze molar contents ranging from 0 to 6%, obtained by solvent-casting, were investigated using a combination structural, dielectric, electromechanical techniques. For mol %...
Photopatternable fluoropolymers with high dielectric constant were prepared by direct azidation of commercially available poly(vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene). The produced exhibit very constant, while being photopatternable without the use any additives. These cross-linked polymers appear to have reduced crystallinity compared pristine ones, as cross-linking is known introduce defects in polymer conformation, leading a reduction crystallinity. Cross-linking...
Fluorinated electroactive polymers (FEPs) are among the most interesting insulating materials for production of organic electronic devices. Their ability to tune their response an applied electric field makes them appropriate vastly different applications in electronics. However, due chemical inertness such and rather complex synthetic processes required production, introducing additional functionality FEPs remains open challenge. Here, we present a facile way introduce more specifically...