Abstract
Structure and surface polarity properties of poly(vinylformamide-co-vinylamine) (PVFA-co-PVAm)/silica hybrid materials are investigated by means of electrokinetic measurements, atomic force microscopy (AFM), and solvatochromic probes. AFM measurements show the complete covering of the silica surface with the PVFA-co-PVAm layer, which has a thickness between 0.5 and 2 nm depending on the content of the poly(vinylamine) (PVAm) component of the copolymer. The ET(30) surface polarity parameters of PVFA-co-PVAm/silica hybrid particles were investigated by two differently substituted Reichardt's dyes, 2,6-diphenyl-4-(2,4,6-triphenyl-N-pyridino)phenolate (1) and its lipophilic derivative 2,6-di(4-tert-butylphenyl)-4-[tris-2,4,6-(4-tert-butylphenyl-N-pyridino)]phenolate (2). Adsorption of the basic polymer PVFA-co-PVAm on silica significantly decreases the hydrogen bond donating capacity of the former silica surface, and therefore the ET(30) surface polarity decreases linearly with increasing the content of the P...
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