Influence of additives on the morphology of PVDF membranes based on phase diagram: Thermodynamic and experimental study |
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| Authors: | Sajjad Mohsenpour Abdollah Khosravanian |
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| Affiliation: | 1. Chemical and Petroleum Engineering School, Shiraz University, Shiraz 71348‐51154, Iran;2. Chemical and Petroleum Engineering Department, Sharif University of Technology, Tehran 11155‐8639, Iran |
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| Abstract: | In the present study, the morphology of asymmetric poly(vinylidene fluoride) blend membranes which were prepared by the phase inversion method is rationalized by comparing two non‐dimensional number represent thermodynamic and kinetic properties of the prepared membrane. These two parameters change phase diagram and demixing rate between solvent and nonsolvent. TiO2 nanoparticles and polyvinylpyrrolidone were used as additives. Hansen solubility parameters of the components are calculated by Van Krevelen method. Furthermore, kinetic and thermodynamic properties of the prepared solutions are determined by drawing phase diagrams and controlling mass transfer rate during precipitation of casting solution. Besides, to further analyze different tests encompass; permeability, rejection, porosity, pore size determination, contact angle, and field emission scanning electron microscopy images were carried out. It is shown, additives as pore former induced higher permeability and porosity, however, at higher concentration of additives high viscosity obstacle mass transfer and sponge‐like morphology is obtained. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135, 46225. |
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| Keywords: | blends membranes morphology separation techniques |
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