Quaternary Polymeric Thermodynamic System and Membrane Formation Mathematical Model
نویسندگان
چکیده
A thermodynamic model of quaternary polymeric solution was developed for membrane formation. It incorporates two mixed solventsN-methyl-2-pyrrolidone (NMP) and tetrahydrofuran (THF), and two high molecular weight polymers cellulose acetate (CA) and polyvinyl chloride (PVC). Also, another polymeric solution was modeled by replacing (CA) with polyvinylpyrrolidone (PVP). The developed model depends on the extended modified Flory-Huggins model. Gibbs free energy was studiedin the range of -200 J/mol at 313K to -450 J/mol at 363K. The polymer blend solution was homogenous in the studied range. In addition, the diffusion model of immersion precipitation process was investigated. The resultsindicate that the ratio of φCA/ φsolvents increases with coagulation time due to removal almost all the solvents from the polymeric solution, while the thickness of polymer membrane decreases due to the coagulation process. The prepared membranes were tested by scan electron microscope and the test results have validated the model results.
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