Combined effect of modified titanium carbide (TiC) particles and ethylene alpha olefins (POE) on properties of ethylene propylene diene monomer (EPDM)/TiC/POE composites for electronic application

For the field of flexible electronic materials, titanium carbide (TiC) is still a new member that needs to be further investigated. In this study, the effects of surface modification, TiC content and ethylene alpha olefins (POE) amount on dielectric properties of ethylene propylene diene copolymer (EPDM) are investigated in detail.

The addition of 20% modified TiC particles can improve the dielectric constant of EPDM control from 2.4 to 8.7 (360% increase) at 105 Hz. However, the complex viscosity of EPDM control increases by 6.4 times at 1.7 Hz and the volume resistivity decreases by 3 order of magnitude. Moreover, the thermal conductivity of EPDM control only increase by 17%.

By comparison, the 20% POE not only increases the dielectric constant of EPDM/TiC (10/2) from 8.7 to 13.5 (55% increase) at 105 Hz, with slight decrease of volume resistivity, but also decreases the complex viscosity of EPDM/TiC (10/2) from 1.19 × 105 Pa·S to 5.78 × 104 Pa·S (51% decrease) at 1.7 Hz.

Meanwhile, the addition of 20% POE can further enhance the thermal conductivity of EPDM/TiC (10/2) from 0.281 W/(m·K) to 0.416 W/(m·K) (48% increase).