Prediction of water contents and flux rate in fluorinate hydrogels Using UNIFAC and EMS methods

The performance of contact lenses on the eye depends on the relative humidity and water transfer characteristics. When the lenses are exposed to air, the surface of the tear film evaporates due to evaporation. Due to the rupture of water surfaces, it flows to the surrounding environment in order to get out of the lens. The eye becomes. In addition, the fitting and correction power of the lens changes, so to design better lenses, it is important to provide a model to examine the degree of solubility, penetration rate and water exit in the lens. For experimental experiments, a fan-shaped evaporator was used to measure the penetration of water into the contact lenses, and a micrometer was used to measure the membrane thickness of these lenses. Samples of contact lenses were prepared by combining fluorinate hydrogels used by commercial companies. Deionized water was also used to clean the lenses and to allow water to penetrate. To investigate the thermodynamic properties of this system, group distribution models were used which are of great interest for the synthesis of design and optimization of thermal separation processes and other industrial applications. They become slaves. In this research, the developed UNIFAC model, which is one of the most widely used group distribution models, was used to calculate water activity. By drawing a diagram of water mass reduction against time, the slope of the diagram was used to calculate the water mass infiltration flux. To interpret the results of water-vapor flux, the developed Stephen-Maxwell model was used. By calculating the chemical potential of the developed Unifac model and using the obtained experimental data for the infiltration rate of water in the polymer membrane, the water diffusion coefficient in the membrane was calculated. Bringing this quantity to the studied system, the amount of water and the speed of water penetration in the system were predicted under different conditions [۱].