Experimental data and correlation of surface tension of binary polymer solutions at different temperatures and atmospheric pressure
Advancing the chemical engineering fundamentals
Thermodynamics (T2-1P)
Keywords: Surface tension, polymer solution, correlation
Thermophsical properties are required both for engineering and product design. The surface tension of a liquid mixture is an important property which plays an important role in affecting the mass and heat transfer at the interface. For the chemical engineer, surface tension not only determines the quality of industrial products such as coatings, paints, detergents, cosmetics and agrochemicals, but also affects some important steps in the different production processes such as catalysis, adsorption, distillation and extraction.
In recent years, aqueous polymer solutions, especially poly(ethylene glycol) + water systems, have found widespread applications, mostly because of their use in two phase aqueous systems for separation of biomolecular mixtures.
Despite the success of the aqueous two phase separation technique, data on the properties of phase systems that are necessary for the design of extraction processes and for the development of models that predict phase partitioning are few. Although reviewed surface tensions of pure liquid polymers are available, but experimental data for polymer solutions are extremely scare.
In this work, the surface tension (σ) of aqueous solutions of various PEGs(poly ethylene glycol) with molecular weights of 200,300,and 6000 in water and of poly(propylene glycol) (PPG) with a molecular weight of 2000 in ethanol were measured with an tensiometer model K9 Kruss, Germany in the (293.2-338.2) K temperature range and atmospheric pressure. The results of measurement were fitted to linear equation relating surface tension of the solution to the mass fraction of polymer and the solution temperature. The relationship is proposed as follow:
σ ( mN/m) = a + bw + cT(K)
Where σ is the surface tension of the solution at the measured temperature, a, b and c are the coefficients of the equation, w is the mass fraction of polymer in the solution and T is the solution temperature. The coefficients of this equation are determined by linear multiple regression and the model results are compared with experimental data so that the absolute overall average mean relative deviation of the model is less than 0.55% for PEGs and 0.74% for PPG2000.
See the full pdf manuscript of the abstract.
Presented Monday 17, 13:30 to 15:00, in session Thermodynamics (T2-1P).
