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FTIR spectra (second derivative) of 5% FBPI dispersions held under different pH (6.8 or 7.5) and water hardness (0, 200, or 400 ppm) and sheared at 1000 rpm or 1500 rpm at 40 °C. (A,C,E) refer to dispersions prepared by stirring at 1000 rpm in water with a hardness of 0, 200 or 400 ppm; (B,D,F) to dispersions prepared by stirring at 1500 in a water with a hardness of 0, 200 or 400 ppm.
