In this study, graphene oxide (GO) reinforced epoxy loaded poly(urea-formaldehyde) microcapsules have produced by easy and cost-effective one step in-situ emulsion polymerization method without emulsifier agent. Low amounts of GOhas incorporated into microcapsules without pre-treatment or ultra-speed agitation step. The effect of GO reinforcement on microcapsule size, shell structure, morphology, and thermal behaviour analyzed with Fourier transform infrared spectrometer (FTIR), scanning electronic microscope (SEM) and thermal gravimetric analysis (TGA), respectively. Results revealed that obtained microcapsules are resistant up to 225 °C. Besides, also, the addition of a certain amount of GO (0.5%, wt/ wt) forms pretty small sized (3-4 µm) microcapsules with a smooth surface, since GO nanoparticles act as a surfactant material. On the other hand, by increasing the amount of GO up to 1% (w / w), higher shell thickness was caused due to the coating of the GO layers into the shell. Produced GO-reinforced epoxy loaded microcapsules could be used in self-healing composites and also anticorrosion coatings.
Hiçyılmaz, A. and A. Çelik Bedeloğlu, Vol. 16. 2019. 07-13.
Link: http://www.materialsciencejournal.org/vol16no1/in-situ-graphene-oxide-reinforced-polyurea-formaldehyde-microencapsulation-of-epoxy/
