Preparation Properties of the Surface Modified Graphene Filled Composites

Preparation Properties of the Surface Modified Graphene Filled Composites
그래핀; 고분자 복합재
Issue Date
대한금속재료학회 추계학술대회
Two-dimensional material graphene has attracted significant interests due to its excellent electrical conductivity, mechanical properties, large surface area, low co-efficient of thermal expansion and very high aspect ratio. However, all these superior properties are associated with the existence of single layer graphene. Monolayers of graphene always tend to aggregate through π-π stacking and form three dimensional graphitic structures. Therefore, significant efforts have been spent attempting to overcome this problem. Surface modification of graphene is the potential solution to overcome this problem. Chemically functionalized graphene can be prepared by the covalent and noncovalent modification techniques. Dodecyl amine (DA), 6-Amino-4-hydroxy-2-naphthalenesulfonic acid (ANS) and sulfonated poly(ether ether ketone) (SPEEK) have been selected for the surface modification of graphene oxide (GO) followed by reduction using chemical reducing agents. However, the use of hazardous chemical for the reduction of GO is a major concern to the environments and human health. Therefore, different eco-friendly reducing agents such as pyrrole, wild carrot root, glycine, baker’s yeast have been used for the simultaneous reduction and functionalization of GO. It is seen that all these eco-friendly reducing agents can successfully remove the oxygen functionalities of GO and coverts to graphene sheets. Thermochemical reduction of GO to graphene is also very effective for the production of highly conducting functionalized graphene sheets. Thermochemically reduced graphene homogeneously disperses in the polyimide matrix and a percolation in electrical conductivity is achieved at very low filler loading. The chemically functionalized graphene can also be prepared by one-step sonochemical process in presence of 9-anthralene carboxylic acid (9ACA). It is seen that the specific capacitance of 9ACA and SPEEK modified graphene are very
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