Surface properties of titanate-modified silica gel as measured by inverse gas chromatography

Silica gel was modified at three temperatures by five titanium coupling agents: tris(isooctadecanoato-O)(2-propanolato)titanium, [2-[2-(methoxy-O)ethoxy-O]ethanolato-O]tris(2-methyl-2-propenoato-O)titanium, (isooctadecanoato-O)bis(2-methyl-2-propenoato-O)(2-propanolato)titanium, (4-aminobenzenesulfonato-O)bis(dodecylbenzenesulfonato-O)(2-propanolato)titanium and tris(dodecylbenzenesulfonato-O)(2-propanolato)titanium. Surface properties of these modified materials were measured by inverse gas chromatography and expressed by surface parameters (gamma (d)(s), K-A, K-D). The influence of the modifier structure and modification temperature on surface parameters is presented and discussed. Relationships between surface parameters and solubility parameters used earlier for the description of the physico-chemical state of the modifier monolayer are also shown.