Effect of colloidal silica on the porous structure parameters of microspheres prepared from urea formaldehyde resin and silica gel

The paper concerns studies of the porous structure of spherical microparticles resulting from the polycondensation of urea and formaldehyde in the presence of silica sol (UFR-SG) and silica gel microspheres prepared from the latter. It is disclosed that, when the content of colloidal silica increases, the specific surface area of UFR-SG system rises and the porous structure (pore size distribution) of the obtained silica gel microspheres becomes more uniform.