Hyperbranched Polyborosilazane and Boron Nitride Modified Cyanate Ester Composite with Low Dielectric Loss and Desirable Thermal Conductivity

In this paper, we presented a new strategy for fabrication of polymeric composites combined with low dielectric loss and desirable thermal conductivity. With the incorporation of hyperbranched polyborosilazane (hb-PBSZ) into bisphenol A cyanate ester (BADCy) matrix, the modified hb-PBSZ/BADCy resin with 4 wt% hb-PBSZ possessed a low dielectric constant ((a) over dot) value of 2.37 and relatively low dielectric loss tangent value of 0.008 at 1MHz. Furthermore, by integrating micrometer boron nitride particles (mBN) into hb-PBSZ/BADCy matrix, the mBN/hb-PBSZ/BADCy composites presented relatively low (a) over dot of 3.09, desirable thermally conductive coefficient (lambda of 0.63 W/(m center dot K)) and thermal diffusivity (a of 0.42 mm(2)/s) values. It provides an important perspective for designing dielectric and thermally conductive polymeric composites for electrical packaging and energy storage fields.