Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites

S. Virtanen, H. Ranta, S. Ahonen, Mikko Karttunen, Jani Pelto, K. Kannus, M. Pettersson (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO3)/polypropylene composites with 1.8-8.1 wt % doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, and optical microscopy show that the quality of nanodispersion was similar in all of the filler concentrations studied. However, all of the samples also contained smoothly distributed microparticles. The density of the microparticles increased exponentially when the concentration of nano-CaCO3 was increased in the manufacturing process. The dielectric direct-current breakdown of the composites had a maximum at 1.8 wt % concentration and then decreased as the filler concentration was increased. The differences could be explained by the existence of large microparticles rather than the quality of the nanoparticle dispersion; this indicated the importance of multiscale characterization.
Original languageEnglish
Number of pages8
JournalJournal of Applied Polymer Science
Volume131
Issue number1
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Fingerprint

Calcium Carbonate
Polypropylenes
Calcium carbonate
Electric breakdown
Composite materials
Fillers
Nanoparticles
Dielectric properties
Optical microscopy
Microscopic examination
Permittivity
Doping (additives)
Transmission electron microscopy
Electric potential

Keywords

  • composites
  • dielectric properties
  • microscopy
  • property relations
  • spectroscopy
  • structure

Cite this

Virtanen, S. ; Ranta, H. ; Ahonen, S. ; Karttunen, Mikko ; Pelto, Jani ; Kannus, K. ; Pettersson, M. / Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites. In: Journal of Applied Polymer Science. 2014 ; Vol. 131, No. 1.
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abstract = "Nanodielectrics, a 21st-century phenomena, is envisioned to be the answer for material challenges in progressive high-voltage technology. It is well known that the proper dispersion of nanoparticles plays a key role in improving the dielectric properties of a material, but to understand where changes in the properties of a material originate, it is also essential to reveal the multiscale structure of the material. In this study, the dielectric permittivity, breakdown strength, and structure of nano calcium carbonate (nano-CaCO3)/polypropylene composites with 1.8-8.1 wt {\%} doping were characterized systematically. The combined results from transmission electron microscopy, Raman microscopy, and optical microscopy show that the quality of nanodispersion was similar in all of the filler concentrations studied. However, all of the samples also contained smoothly distributed microparticles. The density of the microparticles increased exponentially when the concentration of nano-CaCO3 was increased in the manufacturing process. The dielectric direct-current breakdown of the composites had a maximum at 1.8 wt {\%} concentration and then decreased as the filler concentration was increased. The differences could be explained by the existence of large microparticles rather than the quality of the nanoparticle dispersion; this indicated the importance of multiscale characterization.",
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Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites. / Virtanen, S.; Ranta, H.; Ahonen, S.; Karttunen, Mikko; Pelto, Jani; Kannus, K.; Pettersson, M. (Corresponding Author).

In: Journal of Applied Polymer Science, Vol. 131, No. 1, 2014.

Research output: Contribution to journalArticleScientificpeer-review

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