Study on the mechanical properties of micropore organic polymer membranes

Abstract

Abstract Micropore Organic polymer membranes are indispensable for membrane filtration with well-established selectivity and permeability. Pressure-driven conditions in harsh acidic or alkaline environments can influence the mechanical properties of these materials. Diminished mechanical properties may include a shortened membrane lifespan, reduced filtration effectiveness, and increased filtration cost. Understanding of the intricate mechanisms influencing the mechanical properties of organic polymer membranes remains incomplete. In this study, a comprehensive investigation was carried out to characterize the mechanical properties of different membrane materials with similar and varying pore size parameters. The influence of different methods of membrane preparation on the mechanical properties of these materials was also explored. The Young’s modulus, tensile strength, and elongation at break values were compared for two organic polymer membranes: polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF). Results showed that the PTFE membranes demonstrated excellent Young’s modulus and tensile strength, while PVDF membranes excelled in elongation at break. Notably, the PTFE membrane with a pore size of 0.45 µm demonstrated a 9.2% higher tensile strength and an impressive 153.5% greater elongation at break compared to the PTFE membrane with a pore size of 3.0 µm. Organic filter membranes prepared by the phase transition method exhibited a more structured fiber filament arrangement, a smoother surface, reduced crack formation and extension, and a uniform pore size and distribution when compared to materials prepared using the tensile method. The results of this study expanded our understanding of the factors that can influence the mechanical properties of organic filtration membranes. These results provide the theoretical basis to explore novel strategies to improve the dependability and effectiveness of membrane separation technology and reduce associated expenses.