Angel Mary Joseph, Baku Nagendra, K. P. Surendran*, and E. BhojeGowd*
Syndiotactic Polystyrene/Hybrid Silica Spheres of POSS Siloxane Composites Exhibiting Ultralow Dielectric ConstantHomogeneously dispersed hybrid silica/syndiotactic polystyrenecomposites were investigated for low-κ dielectric applications. The compositeswere prepared by a solution blending method, and their microstructures wereanalyzed by SEM, TEM, and AFM. Crystallization and phase transformationbehavior of sPS were investigated using differential scanning calorimetry andwide-angle X-ray diffraction. These composites exhibited improved thermalstability and reduced thermal expansion coefficients. Promising dielectricproperties were observed for the composites in the microwave frequency regionwith a dielectric constant (κ = 1.95) and loss (tan δ = 10−4) at 5 GHz.
ACS Appl. Mater. Interfaces,2015,7, 19474−19483