Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

IGC(Inverse Gas Chromatography) was applied to investigate the dispersive component (gSD) of the surface free energy of crystalline silica, fused silica and silane coupling agents-treated silicas. The carbon content of silane coupling agents adsorbed on the surface of silicas was determined by Carbon Determinator. If the assumption is made that each silane coupling agent molecule occupies an area of 50~100?, the adsorption amounts show that multilayers are generally adsorbed onto silica surfaces. The gSD value of crystalline silica is lower than that of fused silica at same temperature. This means that crystalline silica is more stable than fused silica. g - Methacryloxy propyl trimethoxy silane-treated silica shows a relatively high gSD value(42.75 mJ/m2, 160oC). This means that this sample will take the compatability with polyester(27? mJ/ m2, 290oC) at high temperature. g-Glycidoxy propyl trimethoxy silane and g-Mercapto propyl trimethoxy silane-treated silicas exhibit gSD in close agreement with those of almost all resins(30 mJ/m2) at 160oC. The gSD value of g-Amino propyl triethoxy silane-treated silica is similar to that of epoxy resin(40 mJ/m2, 80oC). This means that this sample is compatible with epoxy resin at relatively low temperature.