Influence Of Fluorination On The Physical Properties Of Normal Aliphatic Alcohols

Abstract

Rheological properties of normal aliphatic alcohols and their fluorinated analogs have been studied. The temperature dependences of the density and the kinematic viscosity of fluorinated and normal alcohols are shown to have the same character. The density growth for fluorinated alcohols is revealed, with the shear viscosity growing more pronouncedly, if more hydrogen atoms in the alcohol molecule are substituted by fluorine ones. The calculated thermodynamic properties of a viscous flow testify that fluorinated aliphatic alcohols are more structured in comparison with normal ones. K e y w o r d s: fluorinated aliphatic alcohols, shear viscosity, thermodynamic parameters, viscous flow.

Thermodynamic Parameters of the Viscous Flow in the Aqueous Solutions of Polyols

“…1. On the basis of experimental data obtained for the kinematic viscosity coefficient and assuming the linear character of the dependence ln = ( −1 ), the enthalpy Δ ̸ = is calculated using the formula [15,16]…”

“…4. By plotting the dependences Δ ̸ = = (Δ ̸ = ), the presence (or absence) of the kinetic compensation effect [15,16], i.e. the linear relation between the enthalpy and the empirical entropy of a viscous flow described by the equation…”

“…There are a few possible interpretations of the quantity ̸ = . For instance, this is a temperature at which the process changes abruptly [15]. Or this a temperature that determines the vibration frequency of those bonds in the reaction center of the active complex that will be broken [11].…”

“…The upper concentration limit for the solutions of each researched object was determined by the individual solubility of the specific polyol. For example, the studies were performed with the solutions of the following concentrations: glycerol (10,20,40,50,70,80, and 100 wt%), erythritol (1,5,15,25,30, and 35 wt%), xylitol (5,10,20,30,40,50, and 60 wt%), adonite (10,20,30, and 40 wt.%), sorbitol (5, 10, 20, 30.40, 50, 60, and 70 wt.%), mannitol (1,2,3,5,10,12, and 15 wt%), and dulcite (1, 2, and 3 wt%).…”

Адіабатична Стисливість Водних Розчинів Поліолів

“…This progress is associated with the study of systems that are characterized by a behavior typical of continuous phase transitions. Such systems include, first of all, water [5,6], where the liquid-to-liquid transition was discovered [7][8][9], and aqueous solutions, in particular, of alcohols [10][11][12][13][14].…”