The separation of poly(acrylic acid) from its mixtures with polystyrene emulsion by gel filtration, without destroying the state of dispersion, was undertaken. It was found that the poly(acrylic acid) not absorbed on the polymer surface is almost completely seperated by gel filtration, if the ionic strength, in this emulsion is not so high. Furthermore, the gel filtration study revealed that poly(acrylic acid) molecules are not adsorbed on the polymer surface saturated with surfactant molecules, whereas poly(acrylic acid) molecules, when already adsorbed on the polymer surface, are not easily desorbed by adding another surfactant.
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