Effects of GnF Concentration on the Mechanoelectrical Properties and Surface Morphology of GnF/PDMS Composites


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The graphite nanoflake (GnF)-reinforced polydimethylsiloxane (PDMS) composites (GnF/PDMS composites) are developed as new polymer matrix composites (PMCs) with controllable mechanoelectrical properties. Here, we investigate the effect of GnF concentration on the mechanoelectrical properties (i.e., elastic modulus, fracture strain, and conductivity) of GnF/PDMS composites; the change in the surface morphology of GnF/PDMS composites caused by a variation in GnF concentration is also explored. The mechanoelectrical properties are measured by performing tensile tests on the GnF/PDMS composite specimens with different GnF concentrations of 5.0, 10.0, 12.5, 15.0, 20.0, and 25.0 wt.%. The surface morphology is analyzed in terms of internal void formation and surface roughness. The elastic modulus is measured to be in the range of 1.62 to 13.8 MPa which is proportional to GnF concentration, while the fracture strain and electrical conductivity are respectively characterized to be in ranges of 0.09 to 2.09 and 0.3 to 221.0 S/m which are in inverse proportion to GnF concentration. An increase in GnF concentration leads to increases in internal voids’ amount and surface roughness. The GnF/PDMS composites can be used as sensing materials for detecting both small and large deformations in a variety of engineering applications.



Edited by:

Serge Zhuiykov




Y. Choi et al., "Effects of GnF Concentration on the Mechanoelectrical Properties and Surface Morphology of GnF/PDMS Composites", Key Engineering Materials, Vol. 765, pp. 65-69, 2018

Online since:

March 2018




* - Corresponding Author

[1] R.M. Wang, S.R. Zheng and Y.P. Zheng: Polymer Matrix Composites and Technology, (Woodhead Publishing, United Kingdom 2011).

[2] D.G. Miloaga: Nucleating Effect of Exfoliated Graphite Nanoplatelets on Poly(hydroxybutyrate) and Poly(lactic acid) and their Nanocomposites Properties (Michigan State University, United States of America 2008).

[3] J.A. Riddick, W.B. Bunger and T.K. Sakano: Organic Solvents: Physical Properties and Methods of Purification (John Wiley and Sons, United States of America 1986).

[4] S. Park, G. Nam, J. Kim and S.-H. Yoon: Trans. Korean Soc. Mech. Eng. A. Vol. 40 (2016), p.815.

[5] S. Park, J. Kim, K. Jeon and S.-H. Yoon: J. Nanosci. Nanotechnol. Vol. 16 (2016), p.4450.

[6] J.C. Halpin and J.L. Kardos: Polym. Eng. Sci. Vol. 16 (1976), p.344.

[7] K. Kalaitzidou, H. Fukushima and L.T. Drzal: Carbon. Vol. 45 (2007), p.1446.

[8] D. Stauffer and A. Aharony: Introduction to Percolation Theory (CRC Press, United States of America 1994).