High performance CaCu3Ti4O12/cyanate ester composites with excellent dielectric properties and thermal resistance

High performance composites based on CaCu3Ti4O12 (CCTO) and cyanate ester (CE) were successfully developed with desirable dielectric properties (high dielectric constant and low dissipation factor), outstanding thermal resistance and decreased curing temperature for embedded capacitors. CCTO was treated by γ-aminopropyl triethoxy silane, coded as CCTO(KH550), to investigate the interfacial effects on properties of composites. The addition of CCTO or CCTO(KH550) can significantly reduce the whole curing temperature of CE, while CCTO exhibits a higher catalytic capability than CCTO(KH550). Compared with cured CE resin, two kinds of composites exhibit greatly improved thermal resistance and real permittivity, meanwhile the dissipation factor is still very low. Because the interfacial polarization leads to the dependence of dielectric properties on the frequency and temperature, the improvement of interfacial adhesion for composites is beneficial to reduce the variation of dielectric properties with temperature and frequency, and thus improve the reliability of dielectric materials in applications.