Texture piezoelectric polymer film of high transverse effect and preparation method of film
11 May 2016-
TL;DR: In this paper, a texture piezoelectric polymer film of high transverse effect and a preparation method of the film is presented. But the texture is not textured.
Abstract: The invention discloses a texture piezoelectric polymer film of high transverse effect and a preparation method of the film. The nonisothermal crystallisation process of the film prepared by the solution method is controlled to realize preferable orientation of molecular dipole moment of the film is realized, and the piezoelectric polymer film of the texture structure in which the molecular dipoles are arranged preferably along the plane of the film is prepared. The piezoelectric polymer film is characterized in that the horizontal piezoelectric effect of the film is higher than that of a film of the same components but without texturizing, can be applied to preparation of a sensor of high transverse piezoelectric effect, and has good application prospects in the fields of a flexible nano generation system and a novel energy collection system.
27 Sep 2019
TL;DR: In this article, a polymer film and a preparation method for the preparation of a polyvinylidene fluoride copolymer solution was described, which has excellent ferroelectric property and piezoelectric property.
Abstract: The invention discloses a polymer film and a preparation method thereof. The preparation method comprises the following steps: (1) adhering an oriented polyvinylidene fluoride film to a substrate to obtain an initial film; (2) applying a vinylidene fluoride-trifluoroethylene copolymer solution on the initial film to obtain a pretreated film; (3) performing annealing treatment on the pretreated film at 100-180 DEG C to obtain the polymer film. The polymer film prepared by the invention has excellent ferroelectric property and piezoelectric property.
05 Jul 2019
TL;DR: In this paper, a preparation method of an oriented growth vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)) film is described.
Abstract: The invention discloses a preparation method of an oriented growth vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE)) film. The preparation method comprises the steps that P(VDF-TrFE) powder is evenly dissolved in a tetrahydrofuran organic solvent by taking special graphene/copper as a substrate, the substrate is spin-coated with an appropriate amount of a solution, and lastly vacuum drying and annealing treatment is conducted. According to the preparation method, the technology is simple, the effect is significant, the orientation performance of the prepared P(VDF-TrFE) film is very good, and the preparation method has a wide application prospect in the fields of flexible transducers, infrared detectors, sensors, information storage and the like.
TL;DR: The lying down of the polarization axis and the polarization reversal constrain effect well explain the inferior performance of the LNN film despite its higher crystallinity than that of the granular film.
Abstract: Ultrathin films of the ferroelectric polymer poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] have recently attracted intensive research interest due to their potential applications in emerging organic devices. As special geometry confinement systems, many aspects about their processing, microstructure, and performance are far from being well understood. Here, the cooperative molecular orientation, macroscopic ferroelectric properties, and nanoscale polarization switching behaviors of thermally crystallized ultrathin P(VDF-TrFE) films were investigated. With increasing annealing temperature, the films showed a distinct granule toward layered needle-network (LNN) morphology transition with deteriorated ferroelectricity at a critical point (T-cr) around 140 degrees C. Accompanying this is that the polymer backbone first lay more parallel relative to the substrate, and then exactly at T-cr it showed an abrupt standing-up reorientation. Interestingly, the polarization axis simultaneously showed just opposite orientation and reorientation. Nanoscale polarization switching characterization by using piezoresponse force microscopy and local ferroelectric hysteresis loops revealed a varied molecular orientation in the same needle grain and a polarization reversal constraint effect by the inhomogeneous LNN structure. On the basis of these observations, a tilted-chain lamellae structural model was proposed for the LNN film. The lying down of the polarization axis and the polarization reversal constrain effect well explain the inferior performance of the LNN film despite its higher crystallinity than that of the granular film. The,results may shed some light on the understanding of the intercorrelation among the thermal crystallization, microstructure, and macroscopic performance of ultrathin polymer films.
TL;DR: In this paper, the authors demonstrate a distinct confinement induced cooperative lattice orientation change in ultrathin P(VDF-TrFE) films by using various characterization techniques, including X-ray diffraction (XRD), 2D-XRD, GIXD, and infrared reflection absorption spectra (IRRAS).
Abstract: We demonstrate a distinct confinement induced cooperative lattice orientation change in ultrathin P(VDF-TrFE) films by using various characterization techniques, including X-ray diffraction (XRD), two-dimensional X-ray diffraction (2D-XRD), grazing incidence X-ray diffraction (GIXD), and infrared reflection absorption spectra (IRRAS). Both the polymer chains and the molecular dipoles that are perpendicular to the polymer backbone showed a lying-down orientation change with decreasing thickness. The dipole orientation change showed a good correlation with the thickness dependence of remnant polarization, which were measured from highly reproducible ferroelectric loops in a wide range of thickness (30–250 nm) on inert electrode with suppressed “dead layer” effect. A simple microscopic molecular dipole interaction model revealed that the free energy of different orientation states was related to the thickness and lateral dimension of the polymer crystallites. The findings reveal a unique molecular orientatio...
31 Aug 2009
TL;DR: In this article, a device comprising a pair of electrodes and a nanotube, a nanorod and/or a nanowire is described, where the nanotubes are composed of a piezoelectric and pyroelectric polymeric composition.
Abstract: Disclosed herein is a device comprising a pair of electrodes; and a nanotube, a nanorod and/or a nanowire; the nanotube, nanorod and/or nanowire comprising a piezoelectric and/or pyroelectric polymeric composition; the pair of electrodes being in electrical communication with opposing surfaces of the nanotube, nanorod and/or a nanowire; the pair of electrodes being perpendicular to a longitudinal axis of the nanotube, nanorod and/or a nanowire.
19 Jul 2006
TL;DR: In this paper, a new film of the beta phase of polyvinylidene fluoride (PVDF) and its processing for the elimination of porosity, using a compression force along the thickness direction of the sample at a high temperature.
Abstract: The invention reports a new film of the beta phase of polyvinylidene fluoride (PVDF) and its processing for the elimination of porosity, using a compression force along the thickness direction of the sample at a high temperature. The join action of the compression force and the temperature eliminates the porosity of the PVDF beta phase, improving its mechanical (Young's modulus, yielding and breaking stress, yielding and breaking strain), electrical (dielectric constant, electric rupture) and electromechanical properties (electromechanical coupling, piezoelectric coefficients) and, therefore, the use of the material in technological applications. Non-porous material, 95 to 100% in beta phase and with crystallinity degrees higher than 50%, is obtained.
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