Photo-reduction of Graphene Oxide during Photo-polymerization of Graphene Oxide/Epoxy-Novolac Nanocomposite Coatings

Abstract

In the present study, in-situ UV reduction of graphene oxide (GO) during Photopolymerization of the epoxy-novolac nanocomposite and its effect on the thermal properties of nanocomposite were investigated at different loading level of GO. Chemical structure and structural distortion of GO before and after UV irradiation have been characterized using infrared and Raman spectroscopy as well as scanning electron microscopy (SEM). Obtained results showed that GO has been reduced to graphene (Gr) in effect of UV irradiation. TEM and SEM observations indicated well dispersion of GO sheets within the cured epoxy resin matrix.

Effect of ZnO-GO Particles on the Photopolymerization and Photo-Cleaning of Epoxy Coating

“…Also, the presence of an inorganic component provides additional heat insulating capacity, which stabilizes the nanocomposite against thermal decomposition. Moreover, the presence of strong covalent and noncovalent interactions between the nanohybrid and epoxy matrix enhances the thermal stability of the nanocomposites [30,31]. Fig.…”

Polydopamine nano-hybrids : interfacial and photoactive role in epoxy nanocomposites and polymerization

“…Cationic curing with epoxy monomers and triarylsulfonium antimonate salts were used with broadband UV irradiation at intensities from 30-280 mW/cm 2 and a conveyor speed of 1-6 m/min for potential coating application studies [144][145][146] achieving about 60 % cure within 20s. Epoxy nanocomposite coatings/thin films were also achieved with cationic curing using onium salts with UV exposure at high irradiations intensities [147][148][149] , with the incorporation of fillers such as graphene , a reduction in reaction rates were observed due to light shielding and absorption by the fillers 150 .…”