摘要：

The conditions under which reaction will occur and the products of reaction between trimethylmethoxysilane and a model for a glass surface, triethylsilanol, were studied by gas liquid chromatography. Reaction occurred faster and under milder conditions than anticipated. Immediately after mixing at room temperature, methanol and the unsymmetrical disiloxane, 1,1,1-triethyl-3,3,3-trimethyldisiloxane, were formed; water formed soon thereafter. Simultaneously, the concentration of trimethylmethoxysilane decreased dramatically and the concentration of triethylsilanol decreased to a degree comparable to the amount of unsymmetrical disiloxane formed. The symmetrical disiloxanes were also present and their concentrations were monitored. After about two hours an apparent equilibrium was attained with the unsymmetrical disiloxane as about 60% of the product, but at very long times, 5-10 days, the reaction mixture contained more than 90% 1,1,1-triethyl-3,3,3-trimethyldisiloxane. These reactions occurred readily either near or in acetone, benzene, benzene-octane, or octane as solvent. (Author)

展开