Akhtar, M. Wasim Lee, Yun Seon Yang, Cheol Min Kim, Jong Seok 2024-01-20T03:30:53Z 2024-01-20T03:30:53Z 2021-09-03 2016-10 2046-2069 https://pubs.kist.re.kr/handle/201004/123648 In this study, an effective and novel method was developed to improve the thermal conductivity of epoxy composites by functionalization of graphene. The functionalization of graphene was carried out with a simple refluxing method using a double N-precursor with O-phenylenediamine (OPD), in which the graphene was first treated with acid (2 : 6 molar H2SO4 : HNO3) to form oxygen containing groups on the graphene surface (O-graphene). Amidation and nucleophilic addition reactions through amine groups in OPD contributed significantly to the doping of nitrogen into the graphene layers. The OPD functionalized graphene (OPD-f-graphene) was highly effective and compatible with an epoxy matrix, resulting in homogenous dispersion of a filler in the matrix. The in-plane and through-plane thermal conductivity of the functionalized graphene filled epoxy composite (fG-epoxy) was significantly increased similar to 13 fold and similar to 4.8 fold, respectively, in comparison to the neat epoxy composite (G-epoxy) with the addition of 6 wt% of the filler. This improvement in thermal conductivity was attributed to better dispersion of the filler into fG-epoxy which generated phonon conduction pathways. English ROYAL SOC CHEMISTRY CARBON NANOTUBE COMPOSITES PHASE-CHANGE COMPOSITE MECHANICAL-PROPERTIES CHEMICAL-REDUCTION POLYMER COMPOSITES ALUMINUM NITRIDE MATRIX COMPOSITE RESIN NANOCOMPOSITES OXIDE Functionalization of mild oxidized graphene with O-phenylenediamine for highly thermally conductive and thermally stable epoxy composites Article 10.1039/c6ra17946k 1 RSC ADVANCES, v.6, no.102, pp.100448 - 100458 RSC ADVANCES 6 102 100448 100458 scie scopus 000386439800100 2-s2.0-84994051988 Chemistry, Multidisciplinary Chemistry Article CARBON NANOTUBE COMPOSITES PHASE-CHANGE COMPOSITE MECHANICAL-PROPERTIES CHEMICAL-REDUCTION POLYMER COMPOSITES ALUMINUM NITRIDE MATRIX COMPOSITE RESIN NANOCOMPOSITES OXIDE Graphene Thermal coductivity epoxy compaosites