Preparation And Characterization Of Oxidation Of The Graphite Modified Hydrophilic Membranes

In order to prepare a kind of coating materials with superior comprehensive property, the composite materials of graphite oxide (GO)/(modified) urea-formaldehyde (M)UF and graphite oxide(GO)/polyvinyl formal (PVFM) were prepared by sonication dispersion method. Meanwhile, the properties of the composite materials were also investigated.GO was prepared by Hummers method, and its structure and properties were characterized. It was discovered that a large number of active groups existed in GO, which made it have excellent dispersion in both water and polyvinyl alcohol (PVA).GO/(M)UF composites was prepared by sonication dispersion method. The cross-section of the composites was viewed by SEM. The effect of GO content on the viscosity and shear strength of the composites were studied and the result showed that GO had excellent dispersity in the composites. The result showed that the viscosity and shear strength improved with the increase of GO content and the composites had good thermal stability. In addition, GO/(M)UF membranes were also prepared.GO/PVFM composite was prepared and made into film by casting method. The cross-section of the composite membrane were viewed by SEM. The thermal performance of the composite membranes was characterized and the result showed that it was improved because of the addition of GO.The urea permeation performance of membranes of GO/(M)UF films and GO/PVFM films with different thickness was studied. The research results indicated that the cumulate permeation value decreased with the increase of membrane thickness. When the membrane thickness was the same, the permeation property decreased with the increase of GO content.