Ta. Savitskaya et al., Dynamic membranes based on poly(N-isopropylacrylamide-co-heptadecyl vinyl ketone): Preparation and properties, COLL J, 62(6), 2000, pp. 746-750
Dynamic membranes were prepared from poly(N-isopropylacrylamide-co-heptadec
yl vinyl ketone) having a lower critical solution temperature in an aqueous
solution and being a micelle-forming surfactant. The dependence of the cri
tical concentration of the copolymer micellization an temperature was shown
to have an extreme character with a minimum at the lower critical solution
temperature of thr copolymer. The dynamic membranes are formed on both the
hydrophilic (cellulose) and hydrophobic (polyacrylonitrile) supports. For
the penetrants studied. it was found that the dynamic membrane formed on th
e hydrophobic support favors the rejection of a PEG(6000). while that forme
d on the hydrophilic support rejects more effectively albumin and sodium ce
llulose sulfoacetate. We failed to realize a completely reversible thermal
control of transport properties of the dynamic membranes obtained, while it
was readily accomplished for the membranes obtained by grafting N-isopropy
lamide onto a cellulose matrix.