Dielectric Properties of Semi-IPN Poly(phenylene oxide) Blend/BaTiO3 Composites with Type of Cross-linker

Abstract

The dielectric properties of semi-IPN poly(phenylene oxide) (PPO) blend/BaTiO3(BT) composites are investigated. The composites are fabricated via melt-mixing of crosslinker and pet-oxide in precursor PPO composite obtained by precipitating the suspension consisted of PPO, BT and toluene into methylethyl ketone, poor solvent of PPO. The permittivity of the precursor PPO composites shows higher value than that of integral-blended PPO composites by extruder and coincides with the theoretical Value calculated by logarithmic rule of mixture. The blend of PPO and cross-linked triallyl isocyanurate is most effective for lowering the permittivity and loss tangent owing to the suppression of the orientation polarization of Matrix. In contrast, 4.4'-(1.3-phertylene diisopropylidene) bisaniline, which has amine unit in its structure, increases the permittivity as well as loss tangent of the composite, but it has the ability to density the matrix resin and the interfacial adhesion between the matrix and filler to improves flexural strength and modulus.