Abstract
The kinetics of condensation of octamethyltetrasiloxane-1,7-diol, tetradecamethylheptasiloxane-1,13-diol, and the mixture of oligo(dimethylsiloxanediol)s H(OSiMe 2 ) n OH (n= 4-19) catalyzed by triflic acid mere studied in CH 2 Cl 2 solution. Rates of cyclization and linear growth of various siloxanediols mere compared. The conversion rate decreases with the length of siloxane chain up at least 9 SiO units in the molecule. Complex kinetic dependencies indicate that the mechanism of silanol condensation catalyzed by triflic acid in CH 2 Cl 2 is complicated by the equilibria involving acid, silanol, and water. The scope of operation of the mechanism involving basic assistance by a silanol group (intra-inter catalysis) in the condensation of silanols is discussed
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