Thermal Expansion Coefficient and Young’s Modulus of Silica-Reinforced Epoxy Composite

In this study, the evaluation of thermal stability of the
micrometer-sized silica particle reinforced epoxy composite was
carried out through the measurement of thermal expansion coefficient
and Young’s modulus of the specimens. For all the specimens in this
study from the baseline to those containing 50 wt% silica filler, the
thermal expansion coefficients and the Young’s moduli were
gradually decreased down to 20% and increased up to 41%,
respectively. The experimental results were compared with fillervolume-
based simple empirical relations. The experimental results of
thermal expansion coefficients correspond with those of Thomas’s
model which is modified from the rule of mixture. However, the
measured result for Young’s modulus tends to be increased slightly.
The differences in increments of the moduli between experimental and
numerical model data are quite large.

• Hyu Sang Jo
• Gyo Woo Lee

• Thermal Stability
• Silica-Reinforced
• Epoxy Composite
• Coefficient of Thermal Expansion
• Empirical Model.

[1] Choi, Y. S., Chae, I. S., Kang, Y. S., Won, J. G., Kim, J. J., and Kim, S. D.,
“Tuning Thermal Expansion Coefficient of Composites Containing
Epoxy Resin/Inorganic Additives for Stone Conservation,” Journal of
Conservation Science, Vol. 27, No. 4, pp. 431~440, 2011.
[2] Ku, M. Y., Kim, J. H., Kang, H. Y., and Lee, G. W., "Measurement of
Mechanical Property and Thermal Expansion Coefficient of
Carbon-Nanotube-Reinforced Epoxy Composites," Trans. of the
KSME(B), Vol. 37, No 5, pp. 657~664, 2013.
[3] Dittanet, P., and Pearson, R. A., "Effect of Silica Nanoparticle Size on
Toughening Mechanisms of Filled Epoxy," Polymer, Vol. 53, No 9, pp.
1890~1905, 2012.
[4] Ehrenstien, G. W., Riedel G., and Trawiel P., "Thermal Analysis of
Plastic: Theory and Practice," Hanser, 2004.
[5] Turner, P. S., "Thermal-Expansion Stresses in Reinforced Plastics,"
Research of the National Bureau of Standards, Vol. 37, No 4, pp. 239~250,
1946.
[6] Kerner, E. H., "The Elastic and Thermo-Elastic Properties of Composite
Media," Proc. Phys. Soc. B, Vol. 69, pp. 808~813, 1956.
[7] Mori, T., and Tanaka, K., "Average Stress in the Matrix and Average
Elastic Energy of Materials with Misfitting Inclusions," Acta metall, Vol.
21, pp. 571~574, 1973.
[8] Halpin, J. C., "Stiffness and Expansion Estimates for Oriented Short Fiber
Composites," Composite Materials, Vol. 3, pp. 732~734, 1969.
[9] General description of YDF-161 from Kukdo Chem. Co., Ltd.
[10] Technical bulletin of Jeffamine D230 from Huntsman Corp.
[11] From the measurement of baseline specimens of this study
[12] Technical data sheet of SILNOS 230 from ABC Nanotech Co.,Ltd.
[13] www.accuratus.com