Dielectric, acoustic, densimetric and viscosimetric investigations of the tributylamine + propionic acid system

Abstract

Data obtained at 293 K and atmospheric pressure by different experimental techniques, dielectric, acoustic, densimetric and viscosimetric, give an almost uniform picture of the structure of the investigated binary mixture. The extrema observed at the concentration range 70–75 mol% of propionic acid are explained as a result of the formation of amine–acid associates of composition 1:n where n≈3. Analysis of the dielectric relaxation parameters suggests a high flexibility of these associates.