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The use of metal membranes for fractionating high polymers

1948; Academic Press; Volume: 3; Issue: 6 Linguagem: Inglês

10.1016/s0095-8522(48)90042-7

1878-321X

Jerome L. Rosenberg, Charles O. Beckmann,

Electrostatics and Colloid Interactions

A diffusion cell has been constructed with highly permeable stainless steel membranes. The cell allows more rapid diffusion than previously described glass membrane cells. It is, therefore, suitable for quantity diffusion experiments on large molecules. The method of gaseous diffusion separation has been modified for use in the fractionation of high polymers in solution. Experiments have been performed to demonstrate the partial fractionation of mixtures. A method has been proposed for the construction of size distribution curves by combining data from free diffusion measurements on the fractions obtained by membrane diffusion. Advantages of the diffusion method over the fractional precipitation method are predicted for cases where very large molecular weight fractions free of low molecular weight material are desired.