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Diffusion of poly(vinylpyrrolidone) through cellulose ester membranes

✍ Scribed by H. H. G. Jellinek; B. Blom

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
305 KB
Volume
16
Category
Article
ISSN
0021-8995

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✦ Synopsis

Diffusion coefficients of poly(vinylpyrro1idone) in aqueous solutions were ascertained by the diaphragm method as a function of molecular weight and temperature using mixed cellulose ester (Millipore) membranes. The results agree satisfactorily with diffusion coefficients obtained by other methods. Separation of polymer according to molecular size takes place on diffusion as a function of membrane pore diameter. Also, interaction between the polymer and membrane has been observed resulting in a distribution coefficient between solution and membrane larger than 1. The energy and entropy of activation, repectively, increase with polymer chain length, and their magnitudes are in agreement with the view that segment mobility is operative for the diffusion process.

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