Abstract
A new double-hydrophilic copolymer, poly(ethylene glycol) acrylate-copoly(methacrylic acid), is synthesized and used to control the morphology of barium hydrogen phosphate, which gives different shapes at different pH values: hexagon (pH=7.26), sphere cluster (pH=8), sphere with rough surface (pH=9), sphere with relatively smooth surface (pH=10), and small sphere (pH=11). The order of the particles increases with the pH value increases. The products vary from the out-of-order particles obtained at low pH to the uniform spherical particles at high pH. The results of X-ray diffraction (XRD) indicate that the structures of the particles controlled by copolymers are mainly BaHPO 4 when pH<11. Weak diffraction peaks of Ba 5(PO 4) 3OH (112) and (211) appear when pH=11, which means that precipitates are also mainly BaHPO 4 but with minor Ba 5(PO 4) 3OH. The results can be explained by the results of calculating distribution coefficients of ions ( δ).
Published Version
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