The solvolysis of ethanesulfonic acid esters followed closely first-order kinetics, while the case of polyvinylsulfonic acid esters gave strongly-curved first-order plots according to the solvent composition. With a high acetone content, the solvolysis rates of polymeric sulfonic esters decreased gradually with the lapse of time, while in a high water content, the solvolysis was suppressed at the beginning of the reaction but was accelerated ...