|
|
|
| Properties of epoxy resin adhesive modified by nano-TiO2 |
| 1.College of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, Heilongjiang 150040, China; 2. Key Laboratory of Engineering Dielectrics and its Application, Ministry of Education, Harbin University of Science and Technology, Harbin, Heilongjiang 150080, China |
|
|
|
|
Abstract Using organic nano-TiO2 as modifier, TiO2/ PU-EP adhesive was prepared with epoxy resin toughened by polyurethane. Scanning electron microscopy analysis show that the "island structure" is formed between polyurethane and epoxy, and inorganic phase has good compatibility with polymer matrix. The mechanical properties, thermal stability, dielectric loss, dielectric constant and breakdown field strength of composites were investigated by electronic tensile machine, TGA, dielectric spectrum and voltage tester analyzer. The results indicate that the comprehensive performance can be improved by doping appropriate amount of nanoTiO2 . When the amount of TiO2 is 3%, the shear strength and thermal decomposition temperature of TiO2/ PUEP reach the maximum of 27.14 MPa and 397.82 ℃, respectively. Compared with PU-EP matrix, the shear strength is increased by 22.6% with enhanced thermal decomposition temperature of 17.48 ℃. Under the condition of power frequency, the dielectric constant and dielectric loss are 4.27 and 0.02, respectively, and the breakdown field strength of composite is 14.03 kV·mm-1.
|
|
Received: 28 September 2012
|
|
|
|
|
|
|
2013, Vol. 34 
