Characteristics and Properties of TiO₂/EP‐PU Composite

Abstract

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 TiO2was coated with TCA201 coupling agent through the bonding between the hydroxyl of nano-TiO2particle and coupling agent molecules, the interaction would be beneficial to improve compatibility of inorganic and organic phases, and TCA201-TiO2would 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-TiO2could 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(ε)and dielectric loss (tan⁡δ) showed 4.27 and 0.02, respectively. Its breakdown field strength was 14 kV/mm. Its performance met the requirement of dielectric materials.

Preparation and characterization of poly(urethane-siloxane)/titanium-dioxide nanocomposites

“…On the other side, PUSN5 sample has shown the best thermal stability above T50% values that is due to the larger amount of TiO2. A similar observation that TiO2 nanoparticles enhance heat resistance of epoxy resin/polyurethane composites was reported in literature [26].…”

“…Furthermore, due to the large specific surface area of TiO2, the contact area between nanoparticles and the polymer matrix is significant. The best dispersion of TiO2 nanoparticles was achieved in the sample containing the smallest TiO2 content (1 wt.%) and the obtained Nano effect led to the improvement of thermal stability of PUSNs as also reported in literature [26]. The increase in the content of incorporated TiO2 nanoparticles leads to increased aggregation due to higher nanoparticle interaction forces, resulting in poorer dispersion within the polymer matrix.…”

Synergistic effect between CuCr2O4 nanoparticles and plasticizer on mechanical properties of EP/PU/CuCr2O4 nanocomposites: Experimental approach and molecular dynamics simulation

“…[1][2][3] The epoxy oligomers are widely applied in compositions due to the unique combination of the properties outstanding mechanical, chemical, electrical, and thermal properties. [4][5][6][7][8][9] However, because the EP matrix must withstand high mechanical loads, it is usually reinforced with fillers. [10] These fillers can be selected as particles such as fibers, low-molecular-weight liquid rubbers, and engineering thermoplastics ceramic powders.…”