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

Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites
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
composites, dielectric properties, microscopy, spectroscopy, structure, property relations
0021-8995
39504
Virtanen, Suvi
5f98459d-e6b8-45d4-bdf8-85d264b3f43a
Ranta, Hannes
5b1cef10-39ca-4634-90fc-6380f7a44777
Ahonen, Susanna
f0b92f3e-87a8-4453-a3eb-408e082d1235
Karttunen, Mikko
03c8025d-e140-42d4-b889-866015d5078d
Pelto, Jani
27a0c808-3b31-4b2c-bc87-ec553a7de8a7
Kannus, Kari
5cdc8956-b534-4e9b-a737-d80ff834575c
Pettersson, Mika
80530078-e16c-49df-96bd-d17990e0e38d
Virtanen, Suvi
5f98459d-e6b8-45d4-bdf8-85d264b3f43a
Ranta, Hannes
5b1cef10-39ca-4634-90fc-6380f7a44777
Ahonen, Susanna
f0b92f3e-87a8-4453-a3eb-408e082d1235
Karttunen, Mikko
03c8025d-e140-42d4-b889-866015d5078d
Pelto, Jani
27a0c808-3b31-4b2c-bc87-ec553a7de8a7
Kannus, Kari
5cdc8956-b534-4e9b-a737-d80ff834575c
Pettersson, Mika
80530078-e16c-49df-96bd-d17990e0e38d

Virtanen, Suvi, Ranta, Hannes, Ahonen, Susanna, Karttunen, Mikko, Pelto, Jani, Kannus, Kari and Pettersson, Mika (2014) Structure and dielectric breakdown strength of nano calcium carbonate/polypropylene composites. Journal of Applied Polymer Science, 131 (1), 39504. (doi:10.1002/app.39504).

Record type: Article

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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More information

Published date: January 2014
Keywords: composites, dielectric properties, microscopy, spectroscopy, structure, property relations
Organisations: EEE

Identifiers

Local EPrints ID: 370304
URI: http://eprints.soton.ac.uk/id/eprint/370304
ISSN: 0021-8995
PURE UUID: 340b8dff-8231-4d69-b9ea-401471f0ee06
ORCID for Suvi Virtanen: ORCID iD orcid.org/0000-0003-0502-3183

Catalogue record

Date deposited: 27 Oct 2014 14:29
Last modified: 28 Aug 2019 18:46

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