Next Article in Journal
Efficient Sampling of Knotting-Unknotting Pathways for Semiflexible Gaussian Chains
Next Article in Special Issue
Morphology Development and Mechanical Properties Variation during Cold-Drawing of Polyethylene-Clay Nanocomposite Fibers
Previous Article in Journal
N,N-Dimethylformamide (DMF) Usage in Epoxy/Graphene Nanocomposites: Problems Associated with Reaggregation
Previous Article in Special Issue
Intensification of Electrochemical Performance of AA7075 Aluminum Alloys Using Rare Earth Functionalized Water-Based Polymer Coatings
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle
Polymers 2017, 9(6), 195; doi:10.3390/polym9060195

Effect of Interfacial Polarization and Water Absorption on the Dielectric Properties of Epoxy-Nanocomposites

1
Polymer Competence Center Leoben (PCCL), Roseggerstraße 12, Leoben 8700, Austria
2
Chair of Chemistry of Polymeric Materials, Montanuniversitaet Leoben, Otto-Glöckel Straße 2, Leoben 8700, Austria
3
Department of Electrical Sustainable Energy, Delft University of Technology, Mekelweg 4, Delft CD2628, The Netherlands
4
Prysmian Cables and Systems B.V., Schieweg 9, Delft AN2627, The Netherlands
*
Author to whom correspondence should be addressed.
Academic Editor: Francesco Paolo La Mantia
Received: 20 April 2017 / Revised: 21 May 2017 / Accepted: 23 May 2017 / Published: 28 May 2017
(This article belongs to the Special Issue Polymer Nanocomposites)
View Full-Text   |   Download PDF [4488 KB, uploaded 28 May 2017]   |  

Abstract

Five types of nanofillers, namely, silica, surface-silylated silica, alumina, surface-silylated alumina, and boron nitride, were tested in this study. Nanocomposites composed of an epoxy/amine resin and one of the five types of nanoparticles were tested as dielectrics with a focus on (i) the surface functionalization of the nanoparticles and (ii) the water absorption by the materials. The dispersability of the nanoparticles in the resin correlated with the composition (OH content) of their surfaces. The interfacial polarization of the thoroughly dried samples was found to increase at lowered frequencies and increased temperatures. The β relaxation, unlike the interfacial polarization, was not significantly increased at elevated temperatures (below the glass-transition temperature). Upon the absorption of water under ambient conditions, the interfacial polarization increased significantly, and the insulating properties decreased or even deteriorated. This effect was most pronounced in the nanocomposite containing silica, and occurred as well in the nanocomposites containing silylated silica or non-functionalized alumina. The alternating current (AC) breakdown strength of all specimens was in the range of 30 to 35 kV·mm−1. In direct current (DC) breakdown tests, the epoxy resin exhibited the lowest strength of 110 kV·mm−1; the nanocomposite containing surface-silylated alumina had a strength of 170 kV·mm−1. In summary, water absorption had the most relevant impact on the dielectric properties of nanocomposites containing nanoparticles, the surfaces of which interacted with the water molecules. Nanocomposites containing silylated alumina particles or boron nitride showed the best dielectric properties in this study. View Full-Text
Keywords: epoxy resins; nanoparticles; surface functionalization; silylating agent; water uptake; permittivity; loss factor; interfacial polarization; thermal conductivity epoxy resins; nanoparticles; surface functionalization; silylating agent; water uptake; permittivity; loss factor; interfacial polarization; thermal conductivity
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Marx, P.; Wanner, A.J.; Zhang, Z.; Jin, H.; Tsekmes, I.-A.; Smit, J.J.; Kern, W.; Wiesbrock, F. Effect of Interfacial Polarization and Water Absorption on the Dielectric Properties of Epoxy-Nanocomposites. Polymers 2017, 9, 195.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top