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Concentration dependence of the diffusion coefficient in polymer solution and molecular weight distribution determined by the diffusion method
Author(s) -
Matsuda Hideomi,
Aonuma Hidehiko,
Kuroiwa Shigetaka
Publication year - 1970
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1970.070140208
Subject(s) - cyclohexane , dispersity , polymer , diffusion , polystyrene , molar mass distribution , benzene , materials science , molecular diffusion , solvent , thermodynamics , analytical chemistry (journal) , chemistry , polymer chemistry , chromatography , organic chemistry , physics , operations management , economics , metric (unit)
The effects of the concentration dependence of the diffusion coefficient of a polymer solution (polystyrene in benzene and cyclohexane) in determining molecular weight distribution by the diffusion method are briefly discussed. The value of the ratio D m 0 / D A 0 in a good solvent was found to be close to 1.0 for a polydisperse polymer and less than 1.0 for monodisperse polymers. Molecular weight distribution curves of the polydisperse sample were obtained by the diffusion method in cyclohexane and benzene, respectively. The molecular weight distribution curve obtained for the polymer used in benzene solution looked as if the polymer had a narrow molecular weight distribution. The phenomena cited above were interpreted in the light of the concentration dependence of the diffusion coefficient of polymer solutions.