چكيده به لاتين
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Abstract
The non-homogeneous mixture formed by the diffusion of solid particles into a liquid is called suspension. Suspensions are used in a wide range of industries, including the pharmaceutical, oil and food industries. In the oil industry, suspensions are used in all stages of exploration, extraction, exploitation, transfer, and even oil extraction. Rheological methods are used as a powerful tool for disseminating relationships between structure, formulation, process, and properties. Polymer suspensions exhibit different rheological behaviors, which can be described using rheological models.
In this study, the rheological behavior and stability of polystyrene polymer suspension is investigated. First, the polysaccharide colloidal suspension was manufactured by phase inversion emulsion method, and the rheological behavior of the suspension was investigated using a rheometer. Particle size and dispersion of the suspension were determined using the DLS test and the PDI index. The FTIR test was performed to investigate the chemical structure and final composition of the suspension, and the degree of diffusion and stability of the polystyrene suspension was assessed by the zetaizer device and the measurement of electrical conductivity over time. The rheological properties of the polystyrene colloidal suspension with a diameter of about 490 nm were investigated using a rheometer. Examination of the flow curve using a rheometer device showed that the behavior of the poly-styrene suspension is pseudoplastic and with increasing shear stress the dilution behavior is demonstrated. Due to the above dilution property, it is likely that due to the application of stress, the entanglement of polymer chains will gradually open and the molecules will move more easily, which is due to the viscoelastic properties of the polymer suspension. . By examining the different rheological models, the closest model to the laboratory data and the colloidal yield stress were determined. According to the results obtained from the flow curve and rheological models, the Cason model was considered the most suitable model. Overall, the polystyrene suspension made by phase inversion emulsification showed viscoelastic behavior and dilution against stress. Thinning against stress leads to consistency during storage, thus facilitating the injection and transfer of suspensions during turbulent crude oil flows.
Keywords: polymer suspension, polystyrene, phase inversion emulsion, rheology.
