摘要:
A multilayer film useful for capacitive applications comprises a high energy density layer and a dielectric blocking layer. In some embodiments, a conducting film is located between the high energy density layer and the blocking layer. The high energy density layer may be a fluoropolymer, such as a polymer or copolymer of poly-1,1-difluoroethene or a derivative thereof. The multilayer film may have high energy density (for example,. >8 J/cm3) and low dielectric loss, for example less than 2%, and preferably less than 1%.
摘要翻译:用于电容应用的多层膜包括高能量密度层和介电阻挡层。 在一些实施例中,导电膜位于高能量密度层和阻挡层之间。 高能量密度层可以是含氟聚合物,例如聚-1,1-二氟乙烯的聚合物或共聚物或其衍生物。 多层膜可以具有高能量密度(例如> 8J / cm 3)和低介电损耗,例如小于2%,优选小于1%。
摘要:
Examples of the present invention include high electric energy density polymer film capacitors with high dielectric constant, low dielectric dissipation tangent, and low leakage current in a broad temperature range. More particularly, examples include a polymer film capacitor in which the dielectric layer comprise a copolymer of a first monomer (such as tetrafluoroethylene) and a second polar monomer. The second monomer component may be selected from vinylidene fluoride, trifluoroethylene or their mixtures, and optionally other monomers may be included to adjust the mechanical performance. The capacitors can be made by winding metallized films, plain films with metal foils, or hybrid construction where the films comprise the new compositions. The capacitors can be used in DC bus capacitors and energy storage capacitors in pulsed power systems.
摘要:
Micro-streerable catheters for use in delivering therapeutic treatment in the body, such as ablation and cauterization, and which exhibit precise movement are disclosed. Embodiments include electrical micro-catheters that comprise of electroactive polymers. A preferred embodiment includes a programmable catheter.
摘要:
Polymer blends having improved electromechanical responses and mechanical properties for use in electromechanical application are disclosed. In particular, polymer blend including at least one electrostrictive terpolymer, e.g., poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)) or a derivative thereof, and at least one fluoropolymer, e.g., PVDF or derivative thereof such as PVD-TrFE are disclosed. The polymer blends advantageously have a transverse strain, i.e., a strain perpendicular to the applied electric field direction, that is about 1.5% or higher (as measured at 100 MV/m) while also having an elastic modulus of no less than about 400 MPa (as measured at 30° C. and 1 Hz by dynamic mechanical analyzer).
摘要:
An adaptive lens comprises an actuator and a lens, the lens being mechanically coupled to the actuator so that energization of the actuator adjusts a focal point of the lens. The actuator may comprise a multilayer stack of electromechanical polymer (EMP) layers, having electrodes configured to apply an electric field across each EMP layer. The actuator may be operable to move and/or deform a lens, so as to adjust the focus properties of the lens. In some examples, the actuator has an annular shape, supporting a lens within the inner radius of the annulus. The lens position may be adjusted in an axial direction. In other examples, the actuator may be mechanically coupled a surface of a deformable lens, either directly or through another element of a lens structure. A strain applied to the lens modifies a curved surface of the lens, hence modifying the focal length of the lens.
摘要:
Examples of the present invention relate generally to high electric energy density polymer film capacitors with high charge-discharge efficiency and fast discharge speed. For example, a high energy density polymer capacitor may be fabricated using a polymer blend comprising one or more high dielectric constant PVDF-based polymers (including homopolymers, copolymers and/or terpolymers) and one or more other polymer with low dielectric loss and high volume resistivity compared to the one or more PVDF-based polymers. An example film capacitor may comprise a high temperature fluoropolymer with dielectric loss lower than 0.2% and good film manufacturability. Polymer films can be stretched and orientated at least in one direction to make thinner films with improved performance. Film capacitors can be made by winding metallized films, plain films with metal foils, or using a hybrid construction where the dielectric films comprise the new compositions. Capacitors can also have a multilayer construction where the films are metallized.
摘要:
Micro-streerable catheters for use in delivering therapeutic treatment in the body, such as ablation and cauterization, and which exhibit precise movement are disclosed. Embodiments include electrical micro-catheters that comprise of electroactive polymers. A preferred embodiment includes a programmable catheter.
摘要:
An improved charge or energy storage device having a dielectric charge or energy storage layer including: (i) a copolymer or terpolymer selected from P(VDF-CTFE), P(VDF-CFE), P(VDF-HFP), P(VDF-CDFE), P(VDF-TrFE-CTFE), P(VDF-TrFE-CFE), P(VDF-TrFE-HFP), P(VDF-TrFE-CDFE), P(VDF-TFE-CTFE), P(VDF-TFE-CFE), P(VDF-TFE-HFP), and P(VDF-TFE-CDFE); or (ii) a polymer blend of PVDF homopolymer with a copolymer selected from P(VDF-CTFE); P(VDF-CFE); P(VDF-HFP); and P(VDF-CDFE); or (iii) a polymer blend of a PVDF homopolymer with a terpolymer selected from P(VDF-TrFE-CTFE); P(VDF-TrFE-CFE); P(VDF-TrFE-HFP); P(VDF-TrFE-CDFE); P(VDF-TFE-CTFE); P(VDF-TFE-CFE); P(VDF-TFE-HFP); and P(VDF-TFE-CDFE); or (iv) a polymer blend of copolymer selected from P(VDF-CTFE); P(VDF-CFE); P(VDF-HFP); and P(VDF-CDFE); with a terpolymer selected from P(VDF-TrFE-CTFE); P(VDF-TrFE-CFE); P(VDF-TrFE-HFP); P(VDF-TrFE-CDFE); P(VDF-TFE-CTFE); P(VDF-TFE-CFE); P(VDF-TFE-HFP); and P(VDF-TFE-CDFE).
摘要:
The invention is embodied in an electrical device which includes at least a layer of a ferroelectric polyvinylidine fluoride polymer that has been processed to exhibit an electrostrictive strain of 4% or more when an electric field gradient of 50 megavolts per meter or greater is applied thereacross. The processing of the polymer preferably involves subjecting it to either electron beam radiation or gamma radiation. The polyvinylidine flouride polymer is selected from the group of: polyvinylidine fluoride, polyvinylidine fluoride-trifluoroethylene P(VDF-TrFE), polyvinylidine fluoride tetrafluoroethylene P(VDF-TFE), polyvinylidine fluoride trifluoroethylene-hexafluoropropylene P(VDF-TFE-HFE) and polyvinylidine fluoride-hexafluoropropylene P(VDF-HFE).
摘要:
A piezoelectric-type liquid droplet ejecting device including a piezoelectric element. A predetermined voltage pulse is applied to the piezoelectric element, whereupon residual pressure fluctuations are generated in the pressure chamber of the liquid droplet ejecting device. The piezoelectric element or a separate piezoelectric element generates an electric signal corresponding to the residual pressure fluctuations. A detection circuit receives the electric signal and supplies a detection signal corresponding to the electric signal to a calculation circuit for calculating a voltage pulse. The calculation circuit supplies the voltage pulse to a drive circuit, which applies it to the piezoelectric element. The voltage pulse deforms the piezoelectric element upon application thereto in a manner sufficient to compensate for residual pressure fluctuation in the pressure chamber.