A Facile Approach to Covalently Functionalized Graphene Nanosheet Hybrids and Polymer Nanocomposites

Abstract

Homogeneousd ispersion and ag ood interface between polymer and filler is crucial to obtain high-performance polymer composites. In this work, we use an ovel method employing organic aminopropyl-functionalized nanosilica sols (OAS-sols) to functionalize graphene oxide (GO) and thereby synthesize OAS covalently grafted graphene hybrid nanosheets (OAS-graphene). The spherical OAS covalently attached on the two-dimensional (2D) nanosheet GO surfaces creates OAS-graphene hybrids, which have large surface areas and homogeneous amino active sites distributed on the nanosheets. The OAS-graphene gave an improved dispersion and interface compatibility as well as ad ecreased thermali nterfacial resistance. As ar esult,t he thermalc onductivity and mechanical properties of the epoxy nanocomposites were significantly improved at low loading while maintaining high electricali nsulative properties.[a] Dr.

The Side‐Chain Liquid Crystalline Epoxy Polymer Grafted Nanoparticles for the Thermal and Mechanical Enhancement of Epoxy Nanocomposites

“…They found that the flexural strength and impact strength of 10 wt% fillers filled the composites increased by 20% and 28%, respectively. Fu et al . reported the flexural modulus and impact strength of OAS‐graphene/epoxy nanocomposites were enhanced by 32.8% and 76.3%, respectively at 1.5 wt% loading.…”

Interfacial Thermal Transport between Stacked Functionalized Graphene Nanoflakes

“…In addition, the amino groups can further boost the interfacial heat transfer because amino groups react chemically with epoxy resin and bond graphene to epoxy resin covalently. , Another contribution of functionalization is preventing the aggregation of graphene in the epoxy resin matrix, facilitating graphene to form the three-dimensional network under lower concentrations . Fu et al employed aminopropyl to modify graphene oxide experimentally for better graphene dispersion. The composite’s thermal conductivity increased by 74.13% with a graphene concentration of 1.5 wt %.…”

An efficient approach for constructing 3-D boron nitride networks with epoxy composites to form materials with enhanced thermal, dielectric, and mechanical properties

“…1,5,6 Therefore, many researchers have focused on the development of epoxy-based composite materials that have high thermal conductivities but are electrically insulating. 3,7 Melt and solution mixing are common methods for enhancing the thermal conductivity of a polymer and are used to introduce a large amount of thermally conductive fillers, such as graphite, [8][9][10] carbon nanotubes, 11,12 metallic powders, 13 boron nitride (BN), 14,15 or aluminum nitride. 16 However, polymer-based thermally conductive composites prepared by these methods typically have a random distribution of filler particles.…”