The Reactivity Between Si-OH Groups and Various Functional Groups from a Viewpoint of Adhesion of Cured Silicone Rubbers

Abstract

he reactivity of Si-OH group/Si-OH group, Si-OH group/Al-OH group and Si-OH group/Si-OEt group has been investigated by deriving the activation energies from the adhesion of cured silicone rubbers. Avrami equation is used ti derive the activation energies of curing reactions of epoxy resins and unsaturated polyesters. We thought that Avrami equation could be applied to adhesion process, because the generation of the interface bonding in adhesion could be consider as a kind of curing reaction. As a result, Arami plot was a linear function, and it was shown clearly that Avrami theory was effective. The activation energies of Si-OH group/Si-OH group, Si-OH/Al-OH group and Si-OH group/Si-OEt group were 90.7, 116.6 and 131.7kJ/mol, respectively. From the results, the activation energy clearly depends on the difference of reaction space and steric effects.