Abstract
Several types of hydrophobic gel beads, consisting of an outer crosslinked layer and an inner non-crosslinked or lightly crosslinked part, have been prepared. When the ratio of the thickness of the outer layer to that of the inner part of a gel was small and the difference between crosslinking densities of both layers was sufficiently large, polymers of high molecular weight were excluded from gel beads and polymers of low molecular weight penetrated into gel beads. Thus, eluting a mixture of homologous polymers through the column packed with the gels, using an organic solvent as an eluent, resulted in the polymers being fractionated into two groups. This unusual behaviour of the gels is very similar to that previously reported for hydrophilic poly(vinyl alcohol) gel beads (Hirayama et al.) with a double layer structure.
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