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Fractionation of polymers on a preparative scale by precipitation chromatography

✍ Scribed by J. F. Henderson; J. M. Hulme

Publisher
John Wiley and Sons
Year
1967
Tongue
English
Weight
491 KB
Volume
11
Category
Article
ISSN
0021-8995

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✦ Synopsis

A preparative-scale elution chromatographic column is described which will fractionate 45 g. of polymer in a single operation. The size of the column is kept to manageable dimensions by reducing the temperature differential from 50 to 10Β°C. along the length of the temperature-gradient section. I t appears that this change limits the range of molecular weights that are in this section of the column at any one time which leads to a more uniform distribution of a polymer along the column. The net result is that the ratio of polymer load to cubic capacity of the column as a whole can be increased about tenfold over that for the conventional analytical column. It is shown that the equation derived by Caplan is valid under a variety of conditions and that this equation supports the arguments which lead to a reduced temperature differential in the column.

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