IR spectra and surface structure of polystyrene and polystyrene sulfonic acid coatings on fused silica glass

The surface properties and structure of polystyrene (PS) and polystyrene sulfonic acid (PSSA) coatings on KU-1 and VK-100 quartz glass modified with oligomeric diisocyanate CX-100 are characterized using IR absorption spectroscopy, measuring wetting angles of water (glycerol) and confocal laser scanning microscopy. The surface energies of quartz and obtained PS and PSSA coatings are found to correlate with the integral intensity of absorption bands corresponding to silanol groups of quartz. The composition of functional groups and surface energy of PS and PSSA coatings are shown to follow certain regularities depending on PS and PSSA concentrations. The obtained data are used to manufacture capillary columns for the separation of proteins by high-performance electrochromatography on the basis of the prepared polymer coatings on quartz glass.