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Methods of fractionating polymers by ultrafiltration

✍ Scribed by R. W. Baker

Publisher
John Wiley and Sons
Year
1969
Tongue
English
Weight
395 KB
Volume
13
Category
Article
ISSN
0021-8995

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✦ Synopsis

Polyvinylpyrrolidone and dextran polysaccharides have been fractionated by ultrafiltration by using newly developed membranes with sharp molecular weight cutoffs. Three different experimental techniques were employed: (a) batch ultrafiltration by using progressively more retentive membranes; (b) continuous ultrafiltration by using several similar membranes in series; (c) variable pressure ultrafiltration by using a single membrane and varying the applied pressure. Ultrafiltration is shown to be a technique of preparative fraction having the advantages of simplicity, speed, and economy. This resulted in a rapid drop in flu^.^,^

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