EFFECT OF SYNTHESIS TEMPERATURE ON THE PHYSICOCHEMICAL PROPERTIES OF PVC-PVA-BASED ANION EXCHANGE RESINS

This study investigates the effect of synthesis temperature on the physicochemical and ion exchange properties of anion exchange resins synthesized from polyvinyl chloride (PVC) and polyvinylamine (PVA). Anion exchangers were prepared by substituting chlorine atoms in PVC with amino groups from PVA under controlled thermal conditions ranging from 20°C to 80°C. The swelling degree, ion exchange capacity, density, and surface morphology of the resulting resins were systematically analyzed using gravimetric analysis, FTIR spectroscopy. Experimental results showed that the substitution reaction efficiency increases with temperature, peaking at 60°C, where the highest swelling capacity of 79.8% was observed. FTIR analysis confirmed successful chemical modification by the appearance of characteristic functional groups such as C=O and C–Cl. The study concludes that 60°C is the optimal temperature for achieving a balance between reactivity and structural stability. These findings provide valuable insights into optimizing synthesis parameters for the development of efficient, cost-effective, and thermally stable PVC-PVA-based anion exchangers suitable for environmental and industrial applications.