Influences of filler dispersity in epoxy resin on the electrical and mechanical performances of embedded capacitance materials

Abstract

Except for the intrinsic dielectric property of the dielectric filler, its dispersity in polymer matrix also has a big impact on the electrical and mechanical performances of an embedded capacitance material (ECM). Various dielectric fillers are investigated to find the influences of the type and size on the anti-sedimentation and viscosity decreasing properties of the prepared suspensions. The 0.3 µm barium titanate (BaTiO3) synthesized by hydrothermal method shows the optimal effects in preparing dielectric suspension. And the fabricated ECM show the highest electrical and mechanical performances. Embedded capacitors with different sizes are further processed with low changing ratios under 10%. Reliability tests are also conducted to verify the applicability of the ECM in electronic products. This work shows the importance of the well dispersity of dielectric filler in polymer matrix and provides an efficient method for selecting dielectric fillers suitable for ECM fabrication.