Sustainable in Situ Approach to Covalently Functionalize Graphene Oxide with POSS Molecules Possessing Extremely Low Dielectric Behavior

Abstract

Incorporation of multifunctional inorganic additives into the commercial polymers still stands as the most captivating and effective way to realize new-generation electronic components. Here, we introduce a simple, costeffective, and environmentally benign method to covalently functionalize graphene oxide (GO) with vinyl-and aminopropyl-functionalized hybrid silica spheres with a polyhedral oligomeric silsesquioxane (POSS)−siloxane composition. The reaction has been carried out in a mixture of ethanol and water (used as a medium) at ambient conditions with silane precursors. Later, the synthesized hybrid material has been tested for its dielectric properties after blending with syndiotactic polystyrene, a commercially available insulating semicrystalline polymer. It was observed that the dielectric constant decreases with the addition of GOPOSS up to 1.85 with a dielectric loss of 0.02 at 5 GHz. Significant improvements in the thermal properties of the composites were verified with minimal filler loading.

The Recent Advances of Polymer–POSS Nanocomposites With Low Dielectric Constant

“…The special structure gives it good electrical insulation performance, chemical corrosion resistance, high glass transition temperature, fast crystallization rate, good processing performance, and other advantages. [237][238][239] Joseph et al [240] prepared a thermally and chemically stable sPS-HS composite using POSS siloxane hybrid silica spheres (HS). At 1 MHz, the dielectric constant of the original polymer was 2.53, and after adding 6 vol% of filler, the dielectric constant reduced to 2.03.…”

Nanoporous Crystalline Composite Aerogels with Reduced Graphene Oxide

“…As the catalytic efficiency strongly depends on active sites and available surface area of the catalyst [ 43 , 44 , 45 , 49 ], undesired large polydisperse particles are formed. The prevention of aggregation is also essential to fully exploit the physical properties of GO and obtain composite materials with superior functional properties [ 50 , 52 , 53 , 54 ].…”

Graphene oxide grafted by hyperbranched polysiloxane to enhance mechanical and frictional properties of epoxy resin

“…Nevertheless, the aggregation of GO caused by the Van der Waals force between GO sheets and the weak interfacial adhesion between GO and resin matrix weaken the enhancement effect between GO and EP [12]. Therefore, in the last few years, various kinds of functionalized GO have been fabricated by introducing small molecules and polymers [13][14][15][16][17][18] onto the graphene oxide sheets to improve various properties including the dispersity in composites and the interface bonding performance between fillers and matrix. Yuan et al [13] attached γ-m ethacryloxypropyltrimethoxysilane (KH-570) onto GO sheets via the covalent bonding, and the novel fillers can effectively improve wear and corrosion resistance of polyimide matrix.…”

“…Yuan et al [13] attached γ-m ethacryloxypropyltrimethoxysilane (KH-570) onto GO sheets via the covalent bonding, and the novel fillers can effectively improve wear and corrosion resistance of polyimide matrix. Joseph et al [14] synthesized the GO covalently grafted polyhedral oligomeric silsesquioxanes (POSS) for extremely low dielectric property in syndiotactic polystyrene. Furthermore, the functionalized GO with octa-aminophenyl polyhedral oligomeric silsesquioxanes (OapPOSS) [15] and diamine-functionalized GO with 4,4′-diaminodiphenyl sulfone (DDS) [16] were synthesized to enhance the EP composites, the results showed that the fillers have better dispersity on the entire composites, and the composites showed considerable improved thermal and mechanical properties compared to those of pristine EP.…”