Thermal Stability and Dynamic Mechanical Properties of Nano and Micron-TiO2 Particles Reinforced Epoxy Composites: Effect of Mixing Method
نویسندگان
1 Polymer Research Center, Department of Chemical Engineering, Razi University, Kermanshah, Iran
2 Polymer Research Center, Department of Chemical Engineering, Razi University, Kermanshah, Iran
3 Polymer Research Center, Department of Chemical Engineering, Razi University, Kermanshah, Iran
doi
چکیده
This research work focuses on the performance optimization of composites containing both micron and nano size TiO 2 particles separately in various concentrations and to understand the role of each on the thermal stability and moduli of the composites. Thermal stability of the particle-reinforced composites increased on increasing the concentration of TiO 2, both in nano and micron filled cases, except for the 2.5 wt% nano-filled composite. Storage modulus (E') increased on adding micron-TiO2 to the epoxy hardener resin system from 1 - 2.5 - 5 wt% respectively and decreased dramatically on further increasing the micron TiO 2 content to 7.5 and 10 wt% respectively. Nano TiO 2 particle-reinforced composites showed an increasing trend of storage modulus for 2.5 - 5 - 7.5 wt% TiO 2 filled composites with respect to the neatresin system. Presence of both micron and nano TiO2 particles increased the T g of the composites. Also, the effect of sonication on the modulus and Tg is discussed. As a whole, composites in which the TiO 2 particles were dispersed through the resin matrix by glass rod revealed better results (higher storage moduli and T g) than those mixed by sonication, due to high viscosity of the epoxy resin used.
