Dielectric properties and partial discharge endurance of polypropylene-silica nanocomposite

Takala, M.; Ranta, Hannes; Nevalainen, P; Pakonen, Pertti; Pelto, Jani; Karttunen, Mikko; Virtanen, Suvi; Koivu, Viivi; Pettersson, Mika; Sonerud, Björn; Kannus, K.

doi:10.1109/tdei.2010.5539698

Cited by 110 publications

(65 citation statements)

References 30 publications

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“…Inclusion of low amounts (~1 wt-%) of permittivitymatching nanoparticles such as silica in a suitable polymer matrix has been shown to be a promising approach, and some improvements in the short-term dielectric strength and breakdown distribution homogeneity have been previously reported [2]- [4]. However, as the dielectric breakdown performance of polymer-based thin films is largely dependent on various processing-and material-related aspects [5], [6], a thorough understanding of the underlying factors and optimization of the film processing parameters are crucial in order to achieve improved breakdown strength in practical insulation systems.…”

Section: Introductionmentioning

confidence: 99%

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

Rytöluoto

Ritamäki

Karttunen³

2017

NORD-IS

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This paper summarizes the effects of various compositional, structural and film processing factors on the breakdown behavior of laboratory-and pilot-scale melt-compounded bi-axially oriented polypropylene (BOPP) nanocomposite films with silica fillers. A selfhealing multi-breakdown measurement approach has been extensively utilized for large-area breakdown characterization of a large number of material variants from different processing trials. The results suggest that although the optimum level of silica presumably resides at the low fill-fraction range (~1 wt-%), the silica content itself is not the only determining factor, as compounds with equal silica content were found to exhibit large differences in the breakdown properties depending on the compounding and film processing steps. Dispersion quality and filler agglomeration (in both the nm-and µm-scale) appear to be of great importance. Indications of possible interaction between nano-silica and co-stabilizer Irgafos 168 are also presented. Overall, the laboratory-and pilot-scale film processing trials suggest that up-scaling of the polymer nanocomposite production is sensible with traditional melt-blending technology, although further development and optimization of nanocomposite formulations and processing is necessary.

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Section: Introductionmentioning

confidence: 99%

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

Rytöluoto

Ritamäki

Karttunen³

2017

NORD-IS

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“…where E 2 is the breakdown strength at thickness d 2 (15 µm), E 1 is the measured breakdown strength of the film whose thickness is d 1 and n is a positive constant whose value depends on the material in question. For instance, a value of 0.4 has been used in previous publications related to polypropylene (PP) and PP-based composite materials [1], [2], [3].…”

mentioning

confidence: 99%

“…For instance, a value of 0.4 has been used in previous publications related to polypropylene (PP) and PP-based composite materials [1], [2], [3]. The power law relationship, where applicable, can be used to compare breakdown performance of polymer materials with different average thicknesses.…”

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confidence: 99%

“…Processing was kept the same for both PP-silica and the pure reference PP; a more detailed description can be found e.g. in [1]. Biaxial orientation (simultaneous, 162°C temperature) was performed for square samples cut from the cast films, using Brückner KARO IV sheet stretching machine.…”

mentioning

confidence: 99%

“…PP thick films with 2.6 and 2.4 stretch ratios, for instance, had no observable difference in the results, so these were treated as a single set. Most of the thin films' breakdown results have been published in [1] and [3] with power law correction applied. Results for the thicker films have not been published earlier.…”

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confidence: 99%

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Thickness Dependency in Dielectric Breakdown Strength of Biaxially Oriented Polypropylene-Silica Nanocomposite Films

Ranta¹,

Rytöluoto²,

Lahti³

2018

NORD-IS

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The power law relationship has been used to some extent in order to compare dielectric breakdown strength results between materials of varying thickness. However, especially in case of relatively new materials such as nanocomposites, it can be questioned whether the measured results actually behave accordingly to the power law and to what extent -most importantly, can the power law be used to predict properties of thinner films than those actually measured. This paper addresses the problem in case of biaxially oriented PPsilica nanocomposite films of different thickness, the breakdown results of which are compared and fitted to the power law relationship.

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Polypropylene Cable Insulation

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Dielectric properties and partial discharge endurance of polypropylene-silica nanocomposite

Cited by 110 publications

References 30 publications

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

The Role of Film Processing in the Large-Area Dielectric Breakdown Performance of Nano-Silica-BOPP Films

Thickness Dependency in Dielectric Breakdown Strength of Biaxially Oriented Polypropylene-Silica Nanocomposite Films

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