Syndiotactic Polystyrene/Hybrid Silica Spheres of POSS Siloxane Composites Exhibiting Ultralow Dielectric Constant

Abstract

Homogeneously dispersed hybrid silica/syndiotactic polystyrene composites were investigated for low-κ dielectric applications. The composites were prepared by a solution blending method, and their microstructures were analyzed by SEM, TEM, and AFM. Crystallization and phase transformation behavior of sPS were investigated using differential scanning calorimetry and wide-angle X-ray diffraction. These composites exhibited improved thermal stability and reduced thermal expansion coefficients. Promising dielectric properties were observed for the composites in the microwave frequency region with a dielectric constant (κ = 1.95) and loss (tan δ = 10(-4)) at 5 GHz.

Structure and crystallization behaviour of syndiotactic polystyrene/layered double hydroxide nanocomposites

“…The FTIR results are in good agreement with the X‐ray diffraction results. It has been reported that the addition of inorganic nanofillers can influence the polymorphism of sPS . For example, carbon nanotubes, hybrid silica spheres and modified layered silicates stabilize the thermodynamically stable β form over the α form .…”

Recent development on modification of synthesized barium titanate (BaTiO3) and polymer/BaTiO3 dielectric composites

“…The hybrid silica facilitates the formation of thermodynamically stable β crystalline, which reduces the dielectric constant and loss of sPS to 1.95 and 1 × 10 −4 at 5 GHz, respectively. [85]…”

Design, Preparation and Thermal Characterization of Polystyrene Composites Reinforced with Novel Three-Cages POSS Molecules

“…Since PS is brittle and soften at relatively low temperature, the need of making composites for achieving the characteristics requested for a specific usage. Among the different PS composites [ 6 , 7 , 8 , 9 ], in the last two decades, increasing attention has been paid to those designed and realized by using polyhedral oligomeric silsesquioxanes (POSSs) [ 10 , 11 , 12 ]. Historically a lot of studies and application focused on those materials characterized by the R 2 SiO unit, inorganic silica and/or organic silicones, but more recently silsesquioxanes bearing general composition of RSiO 3/2 gained growing interest [ 13 ].…”