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The high-temperature breakdown strength and charge/discharge properties of the blended film are significantly improved compared with that of pure BOPP film. In recent decades, enhancing the high-temperature resistance of capacitor films was a research focus, but largescale-producing high-temperature resistant films remains a difficult issue.
The high-temperature breakdown resistance of BOPP is a critical factor that directly impacts the effectiveness of film capacitors. We evaluated the breakdown strength of various BOPP/COC thin film at varying temperatures and analyzed the data using the Weibull distribution.
Qin et al. effectively fabricated a 10 μm-thick dielectric COC film for high-temperature storage by uniaxially stretching (Eb achieves 469 MV/m at 140 ℃) . It should be emphasized that BOPP capacitor films for contemporary commercial are near or thinner than 5 μm .
For example, the temperatures in electric vehicle engines can exceed 120 °C, which is much higher than what BOPP film can withstand, it is necessary to add extra cooling systems, leading the inefficiencies in space and expense . Hence, BOPP film capacitors are not appropriate for long-term use in high-temperature conditions.
A thinner film in a capacitor prepared by film winding allows for more parallel groups or lower volume, as possible to realize the miniaturization and light-weight of devices , . Therefore, there is an important need in commercial applications to minimize film thickness by industrial-scale processing.
1. Introduction Biaxially-orientated polypropylene (BOPP) films are commonly used as dielectric materials in film capacitors because of their outstanding breakdown resistance, excellent charge–discharge efficiency, and largescale processability .
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We report on the fabrication of all-in-fiber capacitors with poly(vinylidene fluoride) (PVDF) as the dielectric material. Electrodes made of conductive polymer are separated by a PVDF thin film within a polycarbonate casing that is thermally drawn into multiple meters of light-weight, …
The determined thermal conductivity of the CNT fiber is 34.3 − 0.4 + 0.4 W/m K according to Eq. (4). As thermal diffusivity is defined as α = k/ρc p, combining with the thermal diffusivity measured by the transient method, an important parameter of ρc p is determined to be 1965 kJ/m 3 K. This value, also termed volumetric heat capacity ...
APPLIED PHYSICS LETTERS 97, 133305 2010 Soft capacitor fibers for electronic textiles Jian Feng Gu, Stephan Gorgutsa, and Maksim Skorobogatiya Génie Physique, École Polytechnique de Montréal, Montréal H3C 3A7, Canada Received 12 May 2010; accepted 15 August 2010; published online 30 September 2010 A highly flexible, conductive polymer …
SAN DIEGO / GLOBENEWSWIRE / April 02, 2024 / KULR Technology Group, Inc. (NYSE American: KULR) (the "Company" or "KULR"), renowned for its contributions to sustainable energy management, today …
When the electrospun fiber membrane is stretched to break at 150 °C (strain 140%), the fibers are mostly arranged in one direction (green arrow direction), but the degree of alignment regularity decreases, which is reasonable due to local fiber-to-fiber adhesion (red circle in Fig. 2 (c)); When the electrospun fiber membrane is stretched to break at 160 °C (strain …
Lightweight ablative materials are commonly utilized as thermal protection materials for hypersonic vehicles. Ceramizable phenolic aerogel/carbon fiber (PA/CF) composites modified with TiB2 and B4C were fabricated, which had the characteristics of lightweight, high strength, and low thermal conductivity. The acid-catalyzed phenol-aldehyde polymerization …
Characterization of Thermal Insulation Performance. Infrared images of a) MEPFT‐d and cotton fabrics at cold (−5 °C) and b) high temperatures (60 °C).
Compared to other CNTF acid stretching processes, the DD-CNTF enables a larger LD while improving the overall fiber properties. Short CNT strands (VA-MIT) have higher work of …
Effect of In Situ Thermal Stretching during Oxidative Stabilization on the Orientation of Cyclized Ladder Structure and Its Carbon Fiber
(2) Thermal Drawing into Fiber: The preform was heated in a furnace at a temperature above the softening point of SEBS. It was then drawn into a ber using a roller
The critical stretch value follows from the condition dF e/dx 0. In the case of a uniform threshold distribution, usingthecorrespondingvaluesofp(x c)andP(x c),weobtainx c 1/2. 2.2 Energies in Fiber Bundle Model During Stretching When N is large, one can express the elastic E e and the breaking E b energies in terms of the stretch x as E e(x ...
walled nanotubes, finely dispersed carbon nanofillers, etc., opens the possibility of getting fiber materials with improved thermal conductivity [1-4]. This capacity depends a great deal on both the conditions of heat treatment of the monofilaments and the intensity of their stretching in the heat treatment process.
The effect of in situ thermal stretching during oxidative stabilization on the orientation of cyclized ladder structure was investigated. Based on the structure evolution of PAN fibers with the increasing stabilization temperatures, the stabilization process was classified into three different stages, namely before the onset of cyclization, during cyclization in amorphous region, and …
The effects of aramid fiber content and hot stretch multiplicity on the properties of the composite were investigated. The result shows that when the mass fraction of aramid fiber (AF) powder is 0.3% (PEN/AF3), the composites have the best overall performance, including thermal and mechanical properties.
We have proposed a thermodynamic framework that analyses the role played by dissipation in a fiber stretching process, describes its different stages, and obtains new …
We report an experimental study of thermal manipulation of a highly oriented carbon nanotube (CNT) fiber by mechanical stretching based on the transient electro-thermal …
Utilizing a thermal stretching technique, the uniform FBG structure of is modified to create high temperature chirped FBG. ... Detection of thermal gradients through fiber-optic Chirped Fiber Bragg Grating (CFBG): medical thermal ablation scenario. Opt. Fiber Technol., 41 (2018), pp. 48-55, 10.1016/j.yofte.2017.12.017. View PDF View article ...
This work discusses the performance of flexible strain sensors utilizing a novel tubular fiber composed of polycaprolactone (PCL), carbon nanotubes (CNTs), and …
A method for analytical study of the process of heating polypropylene composite monofilament filled with carbon nanoparticles during its thermal stretching in a tunnel kiln is …
The fiber membranes'' resilience against breakage during stretching demonstrates their capacity to maintain thermal insulation at a specific level. Consequently, they are anticipated to be utilized in the production of protective clothing fabrics and for thermal insulation in irregular spaces.
Utilized to mitigate Thermal Runaway providing for safe and sustainable storage and transportation of Lithium-Ion Cells and Battery Packs up to 2.5 kWh per Case Learn More Thermal …
reported that with the increase of in situ thermal stretching ratio prior to stabilization at 180 oC, the molecular orientation of PAN precursor fiber increased continuously and the crystal orientation of resulting carbon fiber also increased, which indicated stretching during initial shrinkage process was helpful to the orientation of carbon ...
Influence of coagulation bath temperatures on the fiber cross sections and void evolution; coagulation bath DMSO concentration 60 V% and temperature for a 1 and a 2 : 10 °C, b 1 and b 2 : 25 °C ...
Using high-dielectric inorganic ceramics as fillers can effectively increase the dielectric constant of polymer-based composites. However, a high percentage of fillers will …
The fiber network was collected on the aluminum foil. The collected precursor fiber networks were heat-treated at 160 °C under nitrogen atmosphere to obtain fiber aerogels. The fiber aerogels obtained were transferred to a vacuum atmosphere energy-saving box-type electric furnace, and the heating rate was set at 4 °C/min.
The fiber''s latent heat storage and release, thermal reversibility, mechanical properties, and phase change behavior as a function of fiber drawing, were characterized. Differential scanning calorimetry (DSC) results showed that both enthalpies of melting and solidification of the PCM encased within the PP fiber were scarcely influenced by the …
The second stage was the microthermal degradation of aramid fiber before thermal decomposition, mainly because of the degradation of thermally unstable oxygen-containing groups (carboxyl, hydroxyl) on the surface of ANF and the existence of some unstable non-chain nanofibers in the protonation process of aramid fiber [52]. The final phase (about …
The effects of aramid fiber content and hot stretch multiplicity on the properties of the composite were investigated. The result shows that when the mass fraction of aramid fiber (AF) powder is 0.3% (PEN/AF3), the composites …
The fabricated CuI fiber sensor showed the capability to independently and simultaneously detect both mechanical (tensile strain and pressure) and thermal (temperature change) stimuli by measuring distinct …
Li et al. 22 investigated stretching conditions of PTFE hollow fiber membrane fabricated by a cold processing including extrusion, stretching and sintering, aiming to develop a membrane with high ...
The strong compatibility between PP and COC renders their blends highly promising for large-scale processing of biaxial-stretching high-temperature resistant capacitor …
The goal of this study was to develop an analytical method for describing and numerical modeling of the process of thermal stretching of polymer composite monofilament filled with carbon …
Architecture of cuttlebone and flow chart of stretching process. (a) Optical images of a cuttlefish (Mao et al., 2021). (b–e) SEM image and internal details of cuttlebone (Mao et al., 2021). (f) Steps of the stretching process, where F represents the external force exerted by the mould on the honeycomb.
The main research objective involves a comparative study with other natural fibers, comprehensive material characterization, and an examination of thermal and mechanical properties that other researchers have not addressed. The study seeks to understand how varying fiber content impacts thermal conductivity, heat capacity, and diffusivity.
Some percolated nano-structured networks with low-dimensional carbon materials, such as CNT [14], graphene [15] or nano-silver fiber [16], [17], were mainly adopted as the functional fillers of the flexible heaters due to the superior electrical/thermal conductivity. Based on those nano scaled candidates, the resistive heaters with high electro thermal …
With the aim to fabricate the fine porous TPU fiber, the as-obtained porous TPU fibers were subjected to thermal stretching at 100–120 °C. Based on the stretching rates and treatment temperatures, the MEPFs with different diameters and cell structure could be prepared.
Thermal manipulation of materials is of great interest due to various requirements for heat dissipation. We report an experimental study of thermal manipulation of a highly oriented carbon nanotube (CNT) fiber by mechanical stretching based on the transient electro-thermal (TET) method. The thermal property of CNT fibers is measured under ...
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