Poster Presentation : 1P-98 ; Preparation and properties of poly (vinyl phosphonic acid-co-methacrylic acid) microbeads by suspension polymerization

Poly (vinylphosphonic acid-co-methacrylic acid) microbeads were synthesized by suspension polymerization. And their indium adsorption properties were analyzed. The microbeads were measured by FT-IR and scanning electron microscopy (SEM). The microbeads were wrinkled spheres, irrespective of the components and their sizes ranged from 100 to 200 μm. The microbeads were thermally stable up to 260°C. As the vinylphosphonic acid (VPA) content was increased, ion-exchange capacities and the synthetic yields decreased and the water uptakes increased. The optimum synthetic yield, ion-exchange capacity and water uptake were obtained at a 0.5 mole ratio of VPA. In addition the maximum adsorption predicted by the Langmuir adsorption isotherm model was greatest at a 0.5 mole ratio of VPA.