FT-IR/PAS studies of ethylene-bridged polysilses-quioxanes functionalized with different groups

Bridged polysilsesquioxane xerogels containing amine, thiol, acethoxy and urea groups were synthesized by co-condensation of ethylene-bridged monomer, and appropriate alkoxysilanes in the presence of a fluoride-ion catalyst in an ethanol solution. FT-IR/PA spectroscopy was used to determine the chemical composition of the final materials. FT-IR/PAS data testify that all xerogels contain residual silanol groups and some fraction of non-hydrolyzed ethoxygroups. The same data show that amino groups form hydrogen bonds.