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

Abstract

A novel hyperbranched polysiloxane functionalized graphene oxide (HPBSi-GO) containing abundant primary amine, tertiary amine and hydroxyl groups was designed and successfully synthesized though efficient "grafting to" method. The as-synthesized HBPSi-GO was confirmed by FT-IR, XPS and AFM. Moreover, the HPBSi-GO was incorporated into epoxy (EP) resin matrix to fabricate HPBSi-GO/EP composites. The results showed that the HPBSi-GO has better dispersibility than that of unmodified GO in EP matrix. Interestingly, the mechanical and frictional properties of HPBSi-GO/EP composites were simultaneously superior to those of neat epoxy resin. AFM and TOM results revealed that the good properties mainly attributed to the unique inorganic-organic structure of HBPSi-GO, as well as the good interfacial adhesion between HBPSi-GO and EP matrix.

Bioinspired modified graphene oxide/polyurethane composites with rapid self-healing performance and excellent mechanical properties

“…[47][48][49] However, it has been reported that GO tends to aggregate in the polymeric matrix and has poor interfacial interaction with the matrix. 50,51 Therefore, the current strategy is to attach some active groups onto the surface of GO sheets to react and improve the compatibility between GO and matrix. 4,52 Consequently, the above-mentioned information prompted us to believe that integrating modied GO with rational molecule design might generate a novel composite that has not only better self-healing properties but also improved mechanical properties.…”

Phosphorus‐containing hyperbranched polysiloxanes intercalated graphene oxide and their flame retardant effect on epoxy resin

“…Hyperbranched polymeric siloxane (HBPSi) is a three‐dimensional, halogen‐free silane with excellent thermal resistance and low surface energy. The application of HBPSi in the intercalation modification of two‐dimensional materials can enhance the dispersion of two‐dimensional materials in the polymer matrix and improve the thermal stability of composite materials 33–35 . In this study, a series of flame retardant HBPSi with different molecular weights were synthesized through covalent chemical reactions between 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide (DOPO), γ‐aminopropyltriethoxysilane (APTES), and phenylboronic acid (PBA).…”

“…The application of HBPSi in the intercalation modification of two-dimensional materials can enhance the dispersion of two-dimensional materials in the polymer matrix and improve the thermal stability of composite materials. [33][34][35] In this study, a series of flame retardant HBPSi with different molecular weights were synthesized through covalent chemical reactions between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), γ-aminopropyltriethoxysilane (APTES), and phenylboronic acid (PBA). Different layer spacings of GO were obtained by intercalating different molecular weight HBPSi, which were then mixed with EP to form composite materials.…”

Hyperbranched polyamide modified graphene oxide-reinforced polyurethane nanocomposites with enhanced mechanical properties

“…[19][20][21][22] However, it has been reported that GO tends to aggregate in the polymeric matrix, which is ascribed to its large specic surface area and the strong van der Waals forces between carbon layers. 1,23 Current thinking suggests that a key route to effectively enhancing the properties of GO-based polymer composites is achieving the uniform dispersion of GO and strong interfacial interactions between GO and the polymeric matrix. 24 Compared with other nanollers like carbon nanotubes, 25,26 graphite nanoplates, [27][28][29] montmorillonite, 30 and graphene, [31][32][33] there are abundant oxygen-containing groups (e.g., carboxyl, hydroxyl, and epoxide groups) on the surface of GO, 34 which possess the potential to undergo chemical reactions with the matrix.…”