Effect of the ceramic filler features on the properties of photopolymerized BaTiO3-acrylic composites

Barium titanate—acrylic hybrids with ceramic contents ranging between 10 and 70 wt% were successfully prepared by means of photopolymerization. These composites presented a homogeneous distribution of the ceramic particles within the organic matrix. In addition, an almost complete acrylic double-bond conversion took place. Basic electrical properties of the composites were investigated by dielectric spectroscopy. The increase of the ceramic phase content implied a higher dielectric constant; however, a limited influence of the crystalline phase (cubic or tetragonal) and of the mean size of the filler was demonstrated. In fact, even if cubic particles are not ferroelectric, they are able to behave similarly to the tetragonal ones due to the formation of particle clusters.