Concentration oscillations in the condensation of organosilanols
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Auto-oscillations were discovered by TLC in a study of the condensation of RR'Si(OH)2 (R=R′=Me, Et, Ph; R=Me, R′=CH2=CH, Ph, OH) in aqueous organic solvents in the pH range −1–15 up to large degrees of conversion of the monomer (70–100%). The process is characterized by complicated profiles of the kinetic curves containing sections of acceleration and deceleration of the reaction. The nonequilibrium character of the process was established. It was assumed that the phenomena observed arise as a result of association of the monomer and oligomers during the reaction.
Key wordsdiorganosilanols condensation inhibition auto-oscillations association
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