| Silicone is widely used HPLC rigid supporter, desiccant and inorganic fillers. It is a silica gel with large surface area, the plot excellent mechanical stability, thermal stability and kinetic properties. However, the silicone itself there is a marked deficiency in solution pH limits, a clear silica dissolved, unstable performance.
Polyamines silica composite materials is the use of the specific ways in which polyamines organic molecules to covalent load in the silica surface, forming special structure and function of new materials. This method of synthesis of polyamines silica composite materials with ion exchange resin as compared with many advantages, such as high crushing strength, the use of a long life cycle and low cost.
Silica gel surface structure :
In chromatography and industrial water treatment area, amorphous silica gel has been widely used, it has a porous structure of amorphous and not have any X-ray diffraction. Silica exists on the surface of silicon Alcohol Mission (Si-OH) and the exposure of siloxane bonds (Si-O-Si). Silicon Alcohol corporations are strong adsorption of polar groups, and siloxane bond is hydrophobic groups. Siloxane keys on the bond was δ d π - π p strengthen the role of oxygen atoms on the lone pair of e-participation π role, not to participate in CARICOM and the interaction between receptor and can not form hydrogen bonds. Scott and Kucera confirmed siloxane group almost adsorption polar solvent molecules. However, the siloxane bonds hydrophobic effect, could adsorb certain non-polar solvent molecules. Right modified silica, silicon than siloxane-based Alcohol is much more important. Silicon Alcohol corporation may isolated pairs (twins) and the association (including spaces) in different ways, such as exists in silica surface. Recent research shows that not only two or more silicon Association Blends corporation can create bonding right, or even pairs of silicon Alcohol groups also can form bonding right.
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