| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advances in Dielectric Materials and Electronic Devices
|
| Presentation Title |
Effects of β-Silicon Carbide Microstructure on the Electrical Response of PMMA Matrix Nanocomposites |
| Author(s) |
Roshaun Titus, Rosario Gerhardt |
| On-Site Speaker (Planned) |
Rosario Gerhardt |
| Abstract Scope |
Investigated are influences of the ceramic-filler polymer interfaces on the conductivity of β-SiC PMMA nanocomposites. Three SiC fillers were used: micron-sized, nano-sized, and whisker. The composites were fabricated via mechanical mixing and compression molding. Impedance spectroscopy was used to characterize the electrical response of the composites under AC voltage. Nano-SiC resulted in composites with the lowest percolation threshold, at 3 PHR. The whisker-SiC experienced percolation after 12 PHR. However, the largest conductivity measured came from the whisker-SiC at 15 PHR, surpassing that of the nano-SiC maximum measured conductivity. In-situ impedance measurements of compressed SiC fillers revealed that micron-SiC was the most conductive of the three fillers. However, micron-SiC composites gave the lowest conductivity of all composites fabricated. Micron-SiC composites exhibited a drop in conductivity with increasing filler content, suggesting different surface interactions than the others. Detailed microstructure investigations are ongoing. |