Weibull statistics in short-term dielectric breakdown of thin polyethylene films [comment and reply]

Donazzi, F.; Luoni, G.; Laurent, C.

doi:10.1109/94.300245

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Statistical modeling is required to accurately analyze and evaluate the breakdown strength data. We use the Weibull distribution, which is widely used in dielectric strength analysis of polymer films 28–31 . The 2‐parameter Weibull distribution has the cumulative density function (CDF) of the form:

P (E) = 1 - \exp (- {((), \frac{E}{α})}^{β})

where the constants

α

and

β

are the scale and shape parameters of the distribution, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Electrospray deposition of in‐situ UV‐photoactivated polyimide films

Kingsley,

Chiarot

2023

J of Applied Polymer Sci

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In electrospray deposition, a precursor solution, composed of a solute material in a volatile carrier solvent, is atomized into a spray of charged microdroplets under the influence of a strong electric field. As the droplets are in‐flight, the carrier solvent evaporates, leaving behind the solute material that can be delivered to a target surface to create a film. In this work, we employ electrospray deposition to create films of UV‐photosensitive polyimide. Films were deposited using in‐situ UV exposure, where the in‐flight droplets and deposited material were exposed to UV during deposition. The characteristics of these films were compared to films exposed to UV only after deposition (referred to as post‐UV exposure). The microstructure of the deposited films was notably different for the two exposure modes, in which the in‐situ UV exposed films have a wavy/dimpled surface, compared to the flat and smooth surface of the post‐UV exposed films. However, thermogravimetric analysis and Fourier transform infrared spectroscopy showed that the UV activation of the in‐situ UV and post‐UV exposed films was nearly identical. Breakdown testing was conducted to evaluate the dielectric strength of the films. Overall, the in‐situ UV and post‐UV exposed films exhibited similar breakdown strengths of approx. 430–450 V/μm. The use of in‐situ UV exposure cuts in half the processing time for producing thin polyimide films.

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P (E) = 1 - \exp (- {((), \frac{E}{α})}^{β})

where the constants

α

and

β

are the scale and shape parameters of the distribution, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…We use the Weibull distribution, which is widely used in dielectric strength analysis of polymer films. [28][29][30][31] The 2-parameter Weibull distribution has the cumulative density function (CDF) of the form:…”

Section: Dielectric Strength Of Deposited Filmsmentioning

confidence: 99%

Electrospray deposition of in‐situ UV‐photoactivated polyimide films

Kingsley,

Chiarot

2023

J of Applied Polymer Sci

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“…However, due to the stochastic nature of dielectric breakdown, a statistical reliability model was used to analyze the breakdown data for the printed polyimide films. For this analysis, we employed a two-parameter Weibull distribution, which is commonly used for modeling dielectric breakdown strength in polymers. − The cumulative distribution function (CDF) for this distribution has the form The two coefficients in eq , α and β, are the scale and shape of the distribution, respectively. The α- and β-values are determined from the input data (breakdown field strength).…”

Section: Results and Discussionmentioning

confidence: 99%

Electrospray Printing of Polyimide Films Using Passive Material Focusing

Kingsley

Pawliczak

Hurley

et al. 2021

ACS Appl. Polym. Mater.

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In electrospray printing, a high electric potential is used to atomize a liquid solution containing the print material into a spray of charged microdroplets. Rapid solvent evaporation from the droplets renders a spray of charged dry particles that are directed onto a target substrate to print a film. Here, we report on electrospray printing of polyimide, an important polymer in electronics manufacturing, aerospace, and environmental applications. Using a passive electrostatic funnel to focus the print material, films were printed with thicknesses of more than 15 μm. However, the use of the funnel resulted in a significant amount of material deflected away from the target. The separation distance from the emitter to the target substrate was a key print parameter, resulting in different rates of film growth at different distances. The film growth was asymptotic, leading to self-limiting thickness due to the accumulation of electric charge in the film. The functionality of the printed films was evaluated by measuring their wettability and dielectric strength. The films maintained consistent surface wettability for a range of print conditions and film thicknesses. Weibull reliability analysis was performed for characterizing the dielectric strength of the printed films. The thickest films could sustain the highest applied potentials, exceeding 1 kV; however, the probability of breakdown increased with increasing electric field strength. As a result, thinner films had a greater breakdown electric field strength of ∼142 V/μm.

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“…In this study, the DC breakdown strength of composites with different content of filler was measured to pre-select firstly. The failure of dielectric followed a certain probability, and the Weibull distribution was usually used to analyze the breakdown data [18,19]. The scale parameter α, which is known as the characteristic breakdown strength (kV/mm), is the strength at which the breakdown probability is 63.2%.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Humidity on Dielectric Properties of PP-Based Nano-Dielectric

Chi

Liu

et al. 2019

Materials

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Nano-dielectrics are sensitive to humidity and easily degraded in damp environment because of the high surface energy of nanoparticles. In order to study the effect of humidity on the dielectric properties of nano-dielectric, polypropylene (PP) was modified by polyolefin elastomer (POE) and nano-SiO2, and the samples with obvious filling concentration were pre-selected by breakdown strength for damp aging. The aging experiments were carried out in different relative humidity. The dielectric properties of new, hygroscopic saturation and samples after drying were measured and analyzed. It is found that the breakdown strength of hygroscopic saturation nano-dielectrics decreased obviously compared with new samples, and it was difficult to recover after drying. The damp degradation resulted in different changing trends of permittivity of PP and nano-dielectric, but there were relaxation loss peaks of water in both of them. The influence of damp degradation on the trap distribution was studied by thermally stimulated depolarization currents (TSDC), and it was found that the traps level introduced by water molecules was different in PP and nano-dielectrics. All experiment results showed that the performance of nano-dielectrics degraded obviously in humid environment, and it was difficult to recover even after complete drying because of the existence of bounded water molecules in nano-dielectrics.

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Weibull statistics in short-term dielectric breakdown of thin polyethylene films [comment and reply]

Cited by 5 publications

References 2 publications

Electrospray deposition of in‐situ UV‐photoactivated polyimide films

Electrospray deposition of in‐situ UV‐photoactivated polyimide films

Electrospray Printing of Polyimide Films Using Passive Material Focusing

The Effect of Humidity on Dielectric Properties of PP-Based Nano-Dielectric

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