AMINOPOLYSILOXANE GELS - PRODUCTION AND PROPERTIES

Porous poly(3-aminopropyl)siloxane and poly(3-aminopropyl, methyl)silo xane matrices have been produced by hydrolytical polycondensation of ( 3-aminopropyl)triethoxysilane with tetraethoxysilane and methyltrietho xysilane in alcohol/aqueous solutions, the mechanism of polycondensati on being discussed. The porous structure, composition, thermal stabili ty, solubility and acid-base properties of the matrices produced have been investigated. It has been seen that the surface of aminopolysilox anes in contact with aqueous media exists in a zwitter-ion-like form o ver a wide pH range. The speciation of surface coatings at various pH has been calculated. Some kinetic and thermodynamic peculiarities of a cid-base reactions of surface groups have been pointed out.