Multilayered polycarbonate/poly(vinylidene fluoride‐<i>co</i>‐hexafluoropropylene) for high energy density capacitors with enhanced lifetime

Zhou, Zheng; Mackey, Matt; Carr, Joel M.; Zhu, Lei; Flandin, Lionel; Baer, E.

doi:10.1002/polb.23094

Cited by 38 publications

(35 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[22] Several investigations have been realized in the multilayer topologies for actuator applications in order to achieve a low driven voltage, low dissipation factor, low leakage current, high dielectric breakdown strength, high mechanical response, and high energy density. [23][24][25][26] Multilayer topologically structured demonstrates a number of advantages over conventional materials and other actuator systems. Since a few decades, multilayer piezoelectric actuator manufacturing has been developed in a several applications: bi-stable MEMS switches, [27] ultrasonic drills and stacked ultrasonic transducers, [28] and piezoelectric stack actuator for fuel injector.…”

Section: Multilayer Actuator Optimized To Strain Improvementmentioning

confidence: 99%

Surface Correction Control Based on Plasticized Multilayer P(VDF‐TrFE‐CFE) Actuator—Live Mirror

Thetpraphi

Houachtia

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

high-bandwidth communication, civil space surveillance technologies, wireless optical communication systems (UV and free-space systems), hyper-aperture multimirror structures, geoengineering (space mirror), and astronomical systems. [1,2] In particular the light-gathering power of an optical telescope, its "light grasp" or aperture gain, is one of the most important features of a telescope, [3] which requires very precise glass mirror technology.Recently, we have proposed a "World's Largest Telescope" for achieving highcontrast observations that could use this technology. [4][5][6] Such an optical system will be limited by the cost and manufacturability of large mirrors. The work described here, optics fabricated from an optimized electroactive polymer (EAP), could enable optics like these. The new approach will extend conventional active mirror technologies to larger smooth optical surfaces, without abrasive polishing. This means it will be possible to create precisely shaped low scattered light mirrors-suitable to astronomical applications-faster and at lower production costs. Our long-term vision for the new technology is to decrease the mass density (and cost) of mirrors by an order of magnitude.The idea of using force actuator-sensors fabricated from EAPs [3,4] is developed in this work in order to achieve active mirror surface shape control. By manipulating EAPs as active supports, integrated into the mirror structure allows correcting the mirror shape with a continuous actuator force distribution. Figure 1 illustrates how EAPs behave as elastic electromechanical deforming springs. This "electrical polishing" can correct surface shape errors that would be conventionally removed by abrasive grinding. To achieve high optical mirror quality surfaces with a thickness of a few millimeters the EAP glass deformation must have a dynamic range of few microns corresponding to actuator forces of about 1 N. The technique we propose could potentially be achieved using only additive manufacturing via 3D-printing technology.In this article we aim to present the EAP concept for Live-Mirror active optics. We evaluate different polymers in specific actuator designs in order to test their mechanical actuation properties for mirror-actuator prototypes. This article focuses on EAP-based actuator basic properties. Future work will explore how EAP sensors can be integrated into mirror systems.

show abstract

Section: Multilayer Actuator Optimized To Strain Improvementmentioning

confidence: 99%

Surface Correction Control Based on Plasticized Multilayer P(VDF‐TrFE‐CFE) Actuator—Live Mirror

Thetpraphi

Houachtia

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…This technique enables fabrication of polymer films that contain up to thousands of alternating two or three polymeric layers with a continuous layer thickness down to 10 nm. The production of nanometer‐scale polymer layers has been proven to be able to enhance dielectric, optical, mechanical, and gas transport properties.…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies on the layered polymer capacitor films have focused on dielectric properties, including dielectric lifetime, breakdown strength, and hysteresis . Significant enhancements were observed for dielectric lifetime and breakdown strength, and hysteresis was reduced by decreasing poly(vinylidene fluoride)(PVDF) layer thickness.…”

Section: Introductionmentioning

confidence: 99%

“…Another goal of this article was to systematically study the effect of layer thickness on the long‐term dielectric lifetime of PC/P(VDF‐HFP) films by varying the number of layers while maintaining a constant film thickness and composition and to determine the optimum layer thickness in terms of the dielectric lifetime. It was reported that the 32‐ and 256‐layer systems demonstrated an increase in both long‐term dielectric lifetime and short‐term dielectric breakdown strength relative to control and blend films; however, no optimization has been done on the effect of layered thickness on the dielectric properties of layered PC/P(VDF‐HFP) films. In this article, the PC and P(VDF‐HFP) layer thickness was systematically decreased from 5 μm to 20 nm by increasing the number of layers from 3 to 513, and the total film thickness and film composition remained essentially constant.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fracture phenomena in micro‐ and nano‐layered polycarbonate/poly(vinylidene fluoride‐co‐hexafluoropropylene) films under electric field for high energy density capacitors

Zhou

Mackey

Yin

et al. 2013

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

The long-term dielectric lifetime properties of multilayered polycarbonate/poly(vinylidene fluoride-co-hexafluoropropylene) [PC/P(VDF-HFP)] films were measured as a function of the layer thickness. An optimum layer thickness of 160 nm was determined with the longest dielectric lifetime. The morphology of the damaged sites after dielectric breakdown was examined using scanning electron microscope. Acoustic emission detection system was coupled with the dielectric setup to correlate fracture events and dielectric breakdown to thereby elucidate the mechanisms of the enhancements in dielectric lifetime properties. Two types of acoustic signals were always observed during the breakdown process for multilayered films. The high-amplitude signals were attributed to the formation of breakdown pinholes caused by the primary discharge from top to bottom electrode. The subsequent lowamplitude signals were attributed to internal discharges that could further damage the film. The total number of acoustic hits, in particular, low-amplitude hits, increased with decreasing layer thickness, indicating more internal discharges occurred along the layered interface. It was concluded that the breakdown event initiated at a defect initiated "hotspot" formed because of internal pressure buildup. The film was punctured when the pressure buildup inside the film overcame the mechanical strength of the film. More number of PC layers and layer interfaces were desirable to slow down and divert the damage propagation through the film thickness direction. The crazes in P(VDF-HFP) can, however, easily propagate across PC layers with less than 160 nm layer thickness.Recent studies on the layered polymer capacitor films have focused on dielectric properties, including dielectric lifetime, 3 breakdown strength, 1,2 and hysteresis. 14 Significant enhancements were observed for dielectric lifetime and breakdown strength, and hysteresis was reduced by decreasing poly(vinylidene fluoride)(PVDF) layer thickness. Wolak 15 and Mackey 2

show abstract

“…– and responsible for many of their interesting properties. It is thought to be able to provide many useful properties for different materials, such as excellent mechanical properties, dielectric properties, barrier properties, flame‐resistant materials, electromagnetic shielding materials and so on . Thus, much attention has been paid to the preparation of materials with a multilayered structure.…”

Section: Introductionmentioning

confidence: 99%

Enhanced fracture energy during deformation through the construction of an alternating multilayered structure for polyolefin blends

Zhou

Deng

et al. 2018

Polymer International

View full text Add to dashboard Cite

The effects of polymer blend components on the phase morphology, crystallization behavior and mechanical performance of materials processed by high speed thin‐wall injection molding (HSTWIM) and compression molding (CM) processes were investigated. High density polyethylene (HDPE) and polypropylene (PP) containing different ratios of rubber phase (0%, 18% and 21%) were selected to construct different blends. HSTWIM is shown to trigger the formation of a multilayered structure for these blends with oriented polymer crystals and epitaxial growth of HDPE crystals on PP. Such a layered structure is thought to provide a good template for morphological control of various functional polymer composites. Moreover, the addition of rubber in the multilayered structure with the rubber phase partially distributed between layers is observed. These issues are thought to be responsible for the much enhanced fracture energy compared with specimens from CM. The structural details and formation mechanism of these layered structures consisting of different compositions were investigated. Such a study could provide some guidelines for the preparation of high performance bio‐mimic materials or various functional polymer composites with alternating multilayered structure. © 2018 Society of Chemical Industry

show abstract

Multilayered polycarbonate/poly(vinylidene fluoride‐co‐hexafluoropropylene) for high energy density capacitors with enhanced lifetime

Cited by 38 publications

References 23 publications

Surface Correction Control Based on Plasticized Multilayer P(VDF‐TrFE‐CFE) Actuator—Live Mirror

Surface Correction Control Based on Plasticized Multilayer P(VDF‐TrFE‐CFE) Actuator—Live Mirror

Fracture phenomena in micro‐ and nano‐layered polycarbonate/poly(vinylidene fluoride‐co‐hexafluoropropylene) films under electric field for high energy density capacitors

Enhanced fracture energy during deformation through the construction of an alternating multilayered structure for polyolefin blends

Contact Info

Product

Resources

About