Abstract
The structures of dimethoxydimethylsilane oligomers were investigated before and after heat treatment. FT-IR CIRCLE was used to analyze the structures of siloxane oligomers in solution before annealing, and diffuse reflectance was used to analyze them after annealing. Linear siloxane components were predominant in oligomer solution, while half the volume fraction was changed into ring form after annealing. Ring formation proceeded further with increasing molecular weight of the oligomer in solution. When hydrochloric acid (HCl) was used as catalyst for the reaction, the fraction of linear siloxane component was higher and ring formation was easier than without catalyst or with basic DMF catalyst.
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