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Rozprawy doktorskie na temat "P(VDF-TrFE) Polymère piézoélectrique"
Thevenot, Camille. "Élaboration de membranes polymères piézoélectriques souples en vue d’applications biomédicales". Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0197/document.
Pełny tekst źródłaThe work presented here focuses on the preparation of a piezoelectric polymer material aimed to be the sensitive element of a strain sensor of biological tissues. This includes the study of the softening of the copolymer P(VDF-TrFE) necessary to be close of the mechanical properties of an artery, without reducing the piezoelectric coefficient. Plasticized P(VDF-TrFE) films with diethyl phthalate (DEP) were made according to different protocols including doctor blade technique or spin-coating and polarization under high voltage to activate the ferroelectric properties. Depending on the preparation conditions, two distinct structures were obtained with physical properties specific to each of them. For the first type of film, the study of the morphology and the hysteresis loops polarization-electric field showed a new structure of the material, with a demixing of the plasticizer in the matrix. In this case, the coercive field is strongly reduced which allows a decrease of the required high polarization voltage up to 40%, even if the film only contains 50wt% of P(VDF-TrFE). The second type of film, obtained after an annealing at lower temperature, has an almost homogeneous structure and properties close to a mixing law. The coercive field remains comparable to that of the pure P(VDF-TrFE) but the flexibility of the material is greatly increased. The study of the mechanical properties showed that the plasticizer can reduce the Young modulus to 40MPa for 30wt% of DEP in the film. In addition, the remanent polarization and the piezoelectric coefficient are also reinforced. In vitro and in vivo experiments, performed on arteries, of sensors based on these films demonstrated the high potential of the material to detect the strain of soft tissues and to function at biologic human frequencies
Sukumaran, Sunija. "Design and preparation of a micro-harvesting device made of hybrid SMA/Piezoelectric polymer composite". Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0140.
Pełny tekst źródłaSmall-scale energy harvesting to power self-powered electronic devices is tremendously increasing. In this regard, the ability to combine thermal and mechanical harvesting using smart materials pays more attention. We have presented the feasibility of using P(VDF-TrFE) piezoelectric polymer coupled with NiTi shape memory alloy (SMA) to harvest both mechanical and thermal energy in simple scalable devices. A novel multi-layered SMA-P(VDF-TrFE) composite was fabricated and carried out their electro-thermo-mechanical performance. We have designed and developed an experimental bench to perform the electro-thermomechanical characterization of the composite, allowing us to measure the piezoelectric response when it is subjected to periodic heating and cooling. Furthermore, we performed the finite element analysis of the SMA-Piezoelectric composite and simulated the main properties of SMA such as superelastic behavior, one-way shape memory effect, and two-way shape memory effect, to finally identify the overall effective electro-thermomechanical behavior of the SMA-piezoelectric polymer composite. Finally, in order to efficiently harvest the electric charge generated from the P(VDF-TrFE) film, we have studied and compared two types of integrated converters and determined the conditions for effective energy harvesting. These results are promising, which showing the feasibility of this multilayered composite to power small electronics such as wireless sensors, MEMS and biomedical devices in an autonomous way
Gusarova, Elena. "Dispositifs souples pour la récupération d’énergie à base de matériaux organiques piezoélectriques P(VDF-TrFE) imprimés". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT139/document.
Pełny tekst źródłaThis work aims to study innovative solutions for energy harvesting applicable toautonomous wireless sensors for IoT (Internet of Things). It is focused on flexiblepiezoelectric composite materials and a multi-physical approach. The objective is to harvestenergy via strain-induced phenomena from both mechanical and thermal sources, andparticularly sources neglected so far (slow and low). The main idea is the hybridization ofdifferent functional materials with the core of the system being screen printed piezo/pyroelectricmicrogenerators, mandatory to generate electrical charges. The originality of thiswork is to realize large area flexible energy harvesting systems by using ink-basedpiezoelectric copolymers of polyvinylidene fluoride P(VDF-TrFE). This material is veryflexible and durable which makes it attractive for applications in systems with complexshapes. Another benefit of P(VDF-TrFE) is that it does not need to be pre-stretched as PVDFand it is now available in inks for printable electronics which can simplify and reduce theprice of the fabrication process.We first describe the fabrication process of the screen printed P(VDF-TrFE)microgenerators, followed by ferroelectric and piezoelectric characterizations. For thispurpose we have developed optimized methods in open-circuit conditions adapted for flexiblesystems tested and validated on commercial bulk PVDF. The last step was to realize a lowprofile thermal flexible energy harvester prototype (no radiator). It was done by hybridizationof the fabricated microgenerators and foils of shape memory NiTi-based alloy, which is afunctional material sensitive to a given temperature threshold.The key outcomes of this work are: 1) the successful deposition of multilayers ofP(VDF-TrFE) and organic PEDOT:PSS electrode, 2) dielectric, ferroelectric and directpiezoelectric constants reported as a function of film thickness, and 3) the g31 direct voltagecoefficient, measured for the first time, and showing the record value of 0.15 V·m/N. Also,we have demonstrated that in open-circuit conditions, the microgenerators can produce auseful strain-induced voltage of 10 V with an energy density close to 500 μJ/cm3, these valuesbeing limited by the experimental set-up.The concept of thermal energy harvesting composite based on thin film screen printedP(VDF-TrFE) microgenerators was realized and demonstrated to be effective. We concludewith a functional prototype of flexible energy harvester, able to detect non-continuous slowthermal events and producing 37 V (corresponding to 95 μJ) at 65 ºC
Della, Schiava Nellie. "Development of electrostrictive P(VDF-TrFE-CTFE) terpolymer for medical applications". Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI112.
Pełny tekst źródłaIn the 21st century, cardiovascular diseases became a major cause of mortality, the first in the entire world, the second in France after cancers. Indeed, cardiovascular risk factors have been increasing significantly over the past decades and this phenomenon is ongoing today. These factors cause atherosclerosis and lead to coronary acute syndrome, heart attacks, cerebrovascular accident, renal insufficiency but also to peripheral arterial disease (PAOD) and arterial aneurysms. First line treatment of atherosclerosis, regardless of arterial territory concerned, is medical treatment. But, if despite best medical treatment, symptoms are important for patients, interventional treatment may be considered. For aneurysms and for PAOD, vascular surgery is possible. Vascular surgery can be divided into two categories: conventional open repair (COR) and endovascular techniques (ET). During the last ten years, ET became the first line treatment for most arterial injuries. ET has become the first line treatment because it allows a considerable reduction in surgical morbi-mortality and a great reduction in health costs
Vacher, Claire. "Intégration du copolymères P(VDF-TrFE) à une nouvelle technologie de capteurs pyroélectriques : application à la détection d'empreintes digitales". Montpellier 2, 2007. http://www.theses.fr/2007MON20122.
Pełny tekst źródłaSince the 2000s, ATMEL manufactures pyroelectric sensor for the detection of fingerprints. The aim of this PhD is to change the current technology to another easier, less expensive and more robust, and to acquire a pyroelectric material and performance. Our work consisted, as a first step, to understand in detail the behavior of P (VDF-TrFE) pyroelectric used in the sensor, through the influence of heat treatment on the morphology of crystalline structures and the pyroelectric coefficient. Beyond the melting temperature, the thermal treatments was shown to be the most suitable to develop a bêta ferroelectric stable phase and sufficiently crystallized. Meanwhile, our study has demonstrated the ability to improve slightly the pyroelectric activity (about 4 or 5 µ C / m / K) only by modifying certain parameters when applying electric field. A study on the relationship between the production parameters of the copolymer and the pyroelectric performances helped us to define the target material. Then, we have improved the adhesion of the copolymer on the different substrates in the fingerprint sensor. This step is crucial for achieving the development of a new structure. Two solutions have been identified: one based on the introduction of an adhesion promoter under the copolymer and the other copolymer by substituting itself as a blend P(VDF-TrFE) / PMMA2%. As a consequence, we created a new structure in which the number of step of the process was reduced from five to three technological steps
Glasser, Alizée. "Polymer Electronic Inks : Synthesis, Formulation and Processing". Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0381.
Pełny tekst źródłaIn this work, two organic functional inks for printed electronic were studied. The first is composed of a semi-conducting polymer, poly(3,4-ethylene dioxythiophene) (PEDOT), in complex with an insulating polyanion, poly(4-styrene trifluoromethyl (bissulfonylimide)) (PSTFSI), which stabilizes PEDOT in water. The second ink contains the piezoelectric polymer poly(vinylidenefluoride-co-trifluoroethylene) (P(VDFTrFE)) in organic solvents. To be processable using a wide range of deposition processes, the rheological behaviors, wettability and capillary properties of these inks have to be adjusted. For that purpose, both types of inks were formulated. PEDOT inks were formulated for inkjet printing, screen-printing, doctor blading, and for a deposition of lines using a soft blade. No additive is necessary to modify the rheological properties of these inks: by simply tuning the concentration in polymer, their behavior go from Newtonian to shearthinning with gel properties. Further formulations to improve the wettability, the elasticity of the inks, and the conductivity of dried films were performed. P(VDFTrFE) inks were formulated for screen-printing using a gelifying agent, which modify the organization of the polymer in solution, or a mixture of a good and a poor solvent, which gives rise to a micro-emulsion. The Newtonian inks thereby become shear-thinning. Once the properties of the dried films were studied, both types of polymeric inks were used to create functional pressure sensors