Ion-pair Formation From of Hydroxyl Propyl Methyl Cellulose (HPMC)-Water in three weight percentages Tetra Ethyl Ammonium Bromide (TEAB ) At (293.15 and 303.15)K


In the present work , investigated some physical properties of polymeric blending for Hydroxyl Propyl methyl cellulose (HPMC)-water mixtures and tetra ethyl ammonium bromide (TEAB) in the water mixtures (0.1%, 0.2% and 0.3%) at (293.15 and 303.15)K, by using deionized water with specific conductance 5x10-7 Scm-1 at 298.15K .The physical properties of mixed solvents were studying which covered the measurements of densities (d), viscosities (ɳ), dielectric constants (ε) and specific conductance (σ) for the solvent mixtures at specific temperatures from this data. The deviation of solvent mixtures from an ideal behavior was studies by the excess molar volume (V_m^E). The physical properties of Tetra methyl ammonium Bromide (TMAB) and Tetraethyl ammonium Bromide (TEAB) were studying for nine concentrations for each three wt% of HPMC-water mixture at two experimental temperatures covered densities (d), viscosities (ɳ) and molar conductance (Λ) and it were compared between the two salts. The association constant (KA) and limiting molar conductance (Λ₀) was calculated from Shedlovsky equations by using an appropriate computation program. The obtained results give a good agreement between the values of KA which have been derived from Bjerrum equation and by Shedlovsky method.