Abstract
To obtain permittivity graded material whose coefficient of thermal expansion (CTE) was low, this paper investigated the feasibility of changing permittivity of epoxy composites with keeping CTE low. The epoxy composites cofilled with TiO 2 particles and SiO 2 particles (TiO 2 /SiO 2 epoxy composites) were fabricated. To change permittivity of epoxy composites with keeping CTE low, the filling ratio of TiO 2 and SiO 2 was changed from 0:50 to 20:30 in keeping the total volume fraction at 50 vol%. The CTE and relative permittivity of TiO 2 /SiO 2 epoxy composites were compared with those of TiO 2 epoxy composites. It was confirmed that the CTE of TiO 2 /SiO 2 epoxy composites was lower than that of TiO 2 epoxy composites. With increasing TiO 2 volume fraction in keeping the total volume fraction at 50 vol%, the relative permittivity of TiO 2 /SiO 2 epoxy composites was increased from 3.5 to 7.5. These results indicated the possibility of obtaining the permittivity graded material with keeping CTE low.
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