PREPARATION OF MIXED C-18 C-1 HORIZONTALLY POLYMERIZED CHROMATOGRAPHIC PHASES/

The horizontal polymerization of trichlorosilanes on silica is discuss ed with regard to its use in chromatographic separations to reduce sil anol activity and improve hydrolytic stability. It is shown that the u se of C-1 spacers, which were previously demonstrated to provide very low silanol activity, are resistant to a pH 10 solution for at least 3 6 hr. It is also shown that the adsorptivity of water by silica gel is an important factor in achieving dense horizontal polymerization.