Peculiar glass transition temperature rise with decreasing salt concentration in aqueous butyltripropylammonium chloride solution

Glass transition temperatures (Tgʹs) of aqueous butyltripropylammonium and ethyltripropylammonium chloride solutions were measured. The Tg of aqueous butyltripropylammonium chloride solution shows very anomalous Tg variation with increasing water content. A possible cause for the anomalous Tg behavior was presented in conjunction with hydrophobic interaction in the solution.