Capacitor Film Surface Assessment Studies

Galperin, I.; White, W.

doi:10.1109/tei.1985.348756

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…From Figure , the surface morphology of the biaxially stretched film appeared coarser but more uniform than the solution‐cast film. Considering that the electrical breakdown is a localized phenomenon, one hypothesis for an increase in the dielectric breakdown strength of biaxially stretched films over solution‐cast films is the improvement in their surface morphology by elimination of topological defects such as pits or cavities, which otherwise may cause a nonuniform localized concentration of electric field around the defects and, hence, precipitate breakdown at lower voltages . The same factor is responsible for a higher breakdown strength of solution‐cast films compared to compression‐molded films as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…Polymer chain orientation through uniaxial or biaxial stretching affects several polymer properties such as mechanical, thermal, optical, and dielectric and induces anisotropy in these properties . Polymer film orientation is known to improve the dielectric breakdown strength of polymers due to several factors such as an enhancement in crystallinity, increase in the amorphous phase density, improvement in mechanical properties such as the tensile modulus, and reduction in the surface defects and thickness variations . Therefore, the P4MP thin films prepared by solution‐casting were also biaxially stretched to evaluate its effect on the dielectric properties.…”

Section: Resultsmentioning

confidence: 99%

“…[63][64][65][66][67][68] Polymer film orientation is known to improve the dielectric breakdown strength of polymers due to several factors such as an enhancement in crystallinity, increase in the amorphous phase density, improvement in mechanical properties such as the tensile modulus, and reduction in the surface defects and thickness variations. 15,58,59,69 Therefore, the P4MP thin films prepared by solution-casting were also biaxially stretched to evaluate its effect on the dielectric properties. Figure 17 shows the dielectric constant (E 0 ) and loss tangent (tan d) for P4MP (MX) films that were solution-cast with cyclopentane at 25 8C and then biaxially stretched by an elongation ratio (k 1 5 k 2 ) of 1.3 and 1.6 at 50 8C.…”

Section: Effect Of Biaxial Stretching On Dielectric Propertiesmentioning

confidence: 99%

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Evaluation of poly(4‐methyl‐1‐pentene) as a dielectric capacitor film for high‐temperature energy storage applications

Gupta

Offenbach

Ronzello

et al. 2017

J Polym Sci B Polym Phys

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Poly(4‐methyl‐1‐pentene) (P4MP) was characterized to evaluate its viability as a high‐temperature dielectric film for capacitors. Detailed investigation of thermal, mechanical, rheological, and dielectric properties was carried out to assess its high‐temperature performance and processability. P4MP was melt‐processable below 270 °C without degradation and application temperatures as high as 160–190 °C can be achieved. The dielectric constant and loss of melt‐processed P4MP films was comparable to biaxially oriented polypropylene (BOPP) capacitor films, although the dielectric strength was lower. Enhancements in dielectric strength up to 250–300% were achieved via solution‐processing P4MP films, which could be easily scaled up on a roll‐to‐roll platform to yield isotropic, free‐standing films as thin as 3–5 μm. The influence of crystal structure, crystallinity, and surface morphology of these films on the dielectric properties was examined. The dielectric strength was further increased by 450% through biaxial stretching of solution‐cast films, and a Weibull breakdown field of 514 V/μm was obtained. The dielectric constant was very stable as a function of frequency and temperature and the dielectric loss was restricted to <1–2%. Overall, these results suggest that BOP4MP is a promising candidate to obtain similar energy density as a BOPP capacitor film but at much higher operating temperatures. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1497–1515

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Biaxial Stretching On Dielectric Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of poly(4‐methyl‐1‐pentene) as a dielectric capacitor film for high‐temperature energy storage applications

Gupta

Offenbach

Ronzello

et al. 2017

J Polym Sci B Polym Phys

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“…Such impurities as Al, Si or C1 which occur in the film are probably traces of catalysts and they are concentrated chiefly in its surface layer. The film surface has defects such as scoring, surface lines, scratches or discontinuities (in most cases of mechanical origin [12]). …”

Section: Introductionmentioning

confidence: 99%

Effect of surface treatment on polypropylene film-oil interactions

Pospieszna

2001

IEEE Trans. Dielect. Electr. Insul.

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The results are being presented of an investigation to explore the possibility of using surface modification of biaxially oriented polypropylene (BOPP) film in the control of some polymeroil interactions. The deposition of thin-film polymer structures by means plasma polymerization of styrene in r.f. glow discharges have been used as a method of polymer surface treatment. The change of some characteristics of polypropylene after treatment and effect of use of plasma polymer coating on polymer-oil interaction as well as on resulting dielectric properties of polymer-oil system have been investigated.

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“…Improved wettability of the polymer surface would certainly enhance the impregnation, which in turn reduces if not totally prevents the damage due to surface discharges as shown in the previous study of PVDF film [ 5 ] . Another study showed a large number of defects on the surface of PVDF film resulting from the polymer chain structure and processing procedures [6]. As shown by Ieda, the surface states can have significant impact on internal electric fields, affecting space charge injection, electrical conductivity, breakdown phenomena and also piezoelectricity [7].…”

Section: Introductionmentioning

confidence: 98%