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

Data obtained at 293 K and atmospheric pressure by different experimental t echniques, dielectric, acoustic, densimetric and viscosimetric, give an alm ost uniform picture of the structure of the investigated binary mixture. Th e 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 comp osition 1:n where n approximate to 3. Analysis of the dielectric relaxation parameters suggests a high flexibility of these associates.