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Journal of Nanomaterials
Volume 2015, Article ID 167150, 7 pages
Research Article

Characteristics and Properties of TiO2/EP-PU Composite

1Key Laboratory of Engineering Dielectrics and Its Application, Harbin University of Science and Technology, Ministry of Education, Harbin 150080, China
2The College of Material Science & Engineering, Harbin University Science & Technology, Linyuan Road No. 4, Xiangfang District, Harbin, Heilongjiang, China

Received 10 August 2015; Revised 20 November 2015; Accepted 25 November 2015

Academic Editor: Bin Li

Copyright © 2015 Chen Yufei et al. 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.


Polymer matrix of EP-PU was prepared by epoxy resin which was polyurethane toughened, and TCA201 coupling agent was used to modify nano-TiO2, and TiO2/EP-PU composite was synthesized using EP, PU, and TCA201-TiO2. The results of SEM and TEM showed that the surface of TiO2 was coated with TCA201 coupling agent through the bonding between the hydroxyl of nano-TiO2 particle and coupling agent molecules, the interaction would be beneficial to improve compatibility of inorganic and organic phases, and TCA201-TiO2 would disperse evenly in composite and improve performance of composite materials. The mechanical properties, thermal stability, dielectric properties, and breakdown strength of composites were investigated by electronic tensile machine, TGA, dielectric spectrum, and CS2674C type voltage tester. The results indicated that appropriate amount of TCA201-TiO2 could improve mechanical properties, the shear strength of 3 wt%-TiO2/EP-PU reached the maximum value at 27.14 MPa, its thermal decomposition temperature was 397.82°C, enhanced 17.48°C more than that of EP-PU matrix, and its dielectric constant and dielectric loss () showed 4.27 and 0.02, respectively. Its breakdown field strength was 14 kV/mm. Its performance met the requirement of dielectric materials.