Abstract
The characterization method of branched polymers recently proposed by the present authors was tested experimentally by using three samples of randomly branched polystyrene. The distribution curve of the molecular weight and the correlation between branching parameter and molecular weight were determined from the sedimentation velocity and diffusion patterns of each polymer sample in a theta solvent, cyclohexane at 35°C, and it was ascertained that the average molecular weights derived from the distribution curve were in good agreement with the results of osmotic pressure and light scattering measurements. The molecular weight distribution curve thus established was utilized for converting the sedimentation pattern into the sedimentation constant vs. molecular weight relationship of each polymer, from which an average density of branch points was evaluated with the aid of the Kurata—Fukatsu theory. This estimate of the average branch-point density was of reasonable magnitude.
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Matsuda, H., Yamada, I., Okabe, M. et al. Characterization and Solution Properties of Randomly Branched Polymers. Polym J 9, 527–535 (1977). https://doi.org/10.1295/polymj.9.527
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DOI: https://doi.org/10.1295/polymj.9.527