色谱载体用硅球接枝键合相接枝度的测定

Determination of the Graft Degree on the Silica Gel Surface for Chromatographic Carrier

本文用热分析、元素分析及溶液吸附三种方法,对不同浓度的γ-GOPS水溶液与硅球表面接枝键合相的系列样品进行接枝度的测定。认为热分析方法是测定硅胶表面接枝度的适用方法。元素分析误差大,数值偏高。溶液吸附法只能作为比较对硅胶表面接枝量大小的相对方法。

A scries of silica gel packing materials are prepared by bonding organic silane on the silica gel surface with different concentrations of γ-glycidoxypropyltrimethoxy silane water solutions. The graft degree of the bonded phase on these silica gelssurface arc determined by using three methods--Thermal Analysis, ElementAnalysis, and absorption in solution. The results indicate that TA is a suitable method for characterizing the graft degree of the bonded phase of these modified silica gels.