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Materials 2016, 9(4), 239; doi:10.3390/ma9040239

Influence of Coalescence on the Anisotropic Mechanical and Electrical Properties of Nickel Powder/Polydimethylsiloxane Composites

1
Robotics Institute, School of Computer Science, Carnegie Mellon University, Pittsburgh, PA 15213, USA
2
Department of Civil Engineering and Engineering Mechanics, Columbia University, New York, NY 10027, USA
3
Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Changle Chen
Received: 18 January 2016 / Revised: 24 March 2016 / Accepted: 24 March 2016 / Published: 29 March 2016
(This article belongs to the Section Structure Analysis and Characterization)
View Full-Text   |   Download PDF [3445 KB, uploaded 29 March 2016]   |  

Abstract

Multifunctional polymer-based composites have been widely used in various research and industrial applications, such as flexible and stretchable electronics and sensors and sensor-integrated smart structures. This study investigates the influence of particle coalescence on the mechanical and electrical properties of spherical nickel powder (SNP)/polydimethylsiloxane (PDMS) composites in which SNP was aligned using an external magnetic field. With the increase of the volume fraction of the SNP, the aligned SNP/PDMS composites exhibited a higher tensile strength and a lower ultimate strain. In addition, the composites with aligned SNP showed a lower percolation threshold and a higher electrical conductivity compared with those with randomly dispersed SNP. However, when the concentration of the SNP reached a certain level (40 vol. %), the anisotropy of the effective material property became less noticeable than that of the lower concentration (20 vol. %) composites due to the change of the microstructure of the particles caused by the coalescence of the particles at a high concentration. This work may provide rational methods for the fabrication of aligned composites. View Full-Text
Keywords: metal-polymer composite; magnetic field; alignment; coalescence; electrical conductivity; mechanical property metal-polymer composite; magnetic field; alignment; coalescence; electrical conductivity; mechanical property
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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MDPI and ACS Style

Jang, S.-H.; Park, Y.-L.; Yin, H. Influence of Coalescence on the Anisotropic Mechanical and Electrical Properties of Nickel Powder/Polydimethylsiloxane Composites. Materials 2016, 9, 239.

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