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Erschienen in:
01.06.2009 | Original Contribution
PVP superabsorbent nanogels
Erschienen in: Colloid and Polymer Science | Ausgabe 6/2009
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Abstract
Monomer free hydrogel nanoparticles (nanogels) were prepared by crosslinking preformed poly(N-vinyl-2-pyrrolidone) (PVP) entrapped in the aqueous pool of hexadecyltrimethylammonium bromide reverse micelles using the Fenton reaction. The PVP nanoparticles were spherical with a dry diameter of 27 nm. The diameter of the swollen particles was ten times higher, i.e., a swelling ratio, Q, above 900, characterizing this preparation as superabsorbent. PVP nanogel swelling was dependent on bound Fe3+ and varied with pH and ionic strength. Nanogel deswelling by salt followed the anions lyotropic series, i.e., \(
{\text{SCN}}^{ - } < {\text{HSO}}^{ - }_{3} < {\text{NO}}^{ - }_{3} < {\text{I}}^{ - } < {\text{Cl}}^{ - } < {\text{CH}}_{3} {\text{COO}}^{ - } < {\text{CF}}_{3} {\text{SO}}^{ - }_{3}
\). The value of Q reached 6,000 in iron-free PVP nanoparticles at low pH, making this nanogel one of the most efficient swelling systems so far described.