Synthetic hydrogels (10): Anomalous transport behaviour in crown ether-containing hydrogel membranes

B. J. Tighe*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The physical immobilisation of a range of crown ethers within hydrogel membranes of a range of water contents has been examined. The efficiency of the immobilisation process increases with increasing size of the crown and decreasing water content (and thus mean pore radius) of the hydrogels. Successful occlusion was achieved with dicyclohexano-18-crown-6 in a poly(2- hydroxyethyl methacrylate) membrane containing 10% ethyleneglycol dimethacrylate crosslinking agent. Of various ions examined with this modified membrane, K+ was subject to the greatest modulation of its transport behaviour; this being characterised by a substantial initial induction period followed by a steady state rate that never attained the value achieved with unmodified membranes of a similar water content. This behaviour is quite novel in comparison with ionophore modulated transport in hydrophobic membranes but bears some resemblance to that of gas permeation in glassy polymers.

Original languageEnglish
Pages (from-to)3651-3658
Number of pages8
Issue number10
Publication statusPublished - May 2000


  • Hydrogel
  • Ion transport
  • Membrane


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