Abstract
The behavior of the simplest linear siloxane under base-catalyzed conditions was investigated in the temperature range of 60–110 °C for different concentrations of linear siloxane (0.05–0.5 wt %) in dodecane as the solvent with an aqueous solution of sodium hydroxide added as the alkali agent. Samples were taken regularly and analyzed by GC–MS. The activation energy for the studied conditions was found to be equal to 68 kJ/mol. The reaction rate decreased with increasing sodium hydroxide concentration as a result of the formation of dibasic siloxanolates, which are less reactive than single siloxanolates. The proposed reaction mechanism includes stages of polycondensation and siloxane cyclization. The composition of the final reaction mixture (i.e., the ratio between the solid and liquid products) was found to depend strongly on the reaction parameters. Analysis of the solid products by scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDXA), and Fourier transform infrared (FTIR) spect...
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