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Influence of Surface Modified Nanodiamonds on Dielectric and Mechanical Properties of Silicone Composites

1
Materials Science and Environmental Engineering, Tampere University, P.O. Box 589, FI-33014 Tampere, Finland
2
Elastomer Technology and Engineering, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
3
Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego 12/16, 90-924 Lodz, Poland
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(7), 1104; https://doi.org/10.3390/polym11071104
Received: 11 June 2019 / Revised: 27 June 2019 / Accepted: 27 June 2019 / Published: 29 June 2019
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Abstract

Detonation nanodiamonds, also known as ultradispersed diamonds, possess versatile chemically active surfaces, which can be adjusted to improve their interaction with elastomers. Such improvements can result in decreased dielectric and viscous losses of the composites without compromising other in-rubber properties, thus making the composites suitable for new demanding applications, such as energy harvesting. However, in most cases, surface modification of nanodiamonds requires the use of strong chemicals and high temperatures. The present study offers a less time-consuming functionalization method at 40 °C via reaction between the epoxy-rings of the modifier and carboxylic groups at the nanodiamond surface. This allows decorating the nanodiamond surface with chemical groups that are able to participate in the crosslinking reaction, thus creating strong interaction between filler and elastomer. Addition of 0.1 phr (parts per hundred rubber) of modified nanodiamonds into the silicone matrix results in about fivefold decreased electric losses at 1 Hz due to a reduced conductivity. Moreover, the mechanical hysteresis loss is reduced more than 50% and dynamic loss tangent at ambient temperature is lowered. Therefore, such materials are recommended for the dielectric energy harvesting application, and they are expected to increase its efficiency. View Full-Text
Keywords: nanodiamonds; surface modification; silicone; dielectric spectroscopy nanodiamonds; surface modification; silicone; dielectric spectroscopy
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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).

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Shakun, A.; Anyszka, R.; Sarlin, E.; Blume, A.; Vuorinen, J. Influence of Surface Modified Nanodiamonds on Dielectric and Mechanical Properties of Silicone Composites. Polymers 2019, 11, 1104.

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