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The validity of turbidimetric titration in the analysis of polymer mixtures was tested using mixtures of known composition. In some cases, which included three out of four mixtures of block or graft copolymers with homopolymers, the method was not even semiquantitative. Electron micrographs of samples of the suspension taken during titration of single polymer solutions show that assumptions of uniform size or regular geometrical shape of the particles are invalid.
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Allen et al. (1960) studied this question.
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