Toughening of POSS-MPS composites with low dielectric constant prepared with structure controllable micro/mesoporous nanoparticles.

In this work, we developed a modified calcination and extraction method to obtain controllable micro/mesoporous nanoparticle samples POSS-MPS, which were synthesized through glycidyl polyhedral oligomeric silsesquioxane (G-POSS) grafting with aminopropyl-functionalized mesoporous silica (AP-MPS). The POSS-MPS was introduced into the cyanate ester (CE) matrix to optimize the dielectric properties and enhance the toughness of the POSS-MPS/CE nanocomposite. The structure of the hybrid was characterized by FTIR and SEM. The dispersion properties, mechanical properties, dielectric properties and thermal performance were also studied. The results showed that both the C-POSS-MPS and E-POSS-MPS uniformly distribute in the CE matrix with the content of 0.5-4 wt%. The impact strength increased 52% and 60% separately with 2 wt% C-POSS-MPS and E-POSS-MPS addition respectively. The introduction of E-POSS-MPS particles can significantly decrease the dielectric loss value of the POSS-MPS/CE composites to 0.00498, which is of potential in wave transparent composites and structures.