Condensation of α,ω-siloxane diols with aminoalkyl- (alkoxy)silanes

Kinetics of condensation of individual siloxane diols HO[(CH SiO] Si(CH OH (x=3,5,6 and 9) with aminoalkyl-alkoxysilanes (RO) SiR’(CH NHR’’ (R = CH , CH CH ; R’ = CH , OR; R’’ = H, (CH NH ) is described. The second order rate constants point to the significant effect of the siloxane diols chain length on reactivity, which increases for higher homologues (almost an order) of magnitude on coming from x=3 to x=9. The role of substituents at silicon atom is discussed. Three novel functional siloxane oligomers (substrates) are described and characterized.