Ion transport across membranes prepared by gel crystallization

H.A. Klok, Peter Eibeck, Harold Gankema, H. Gankema, René P. Nieuwhof, M. Moller, Martin Möller, David Reinhoudt

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Abstract

A one-step procedure for the preparation of ion-selective membranes is described. The method employs the thermally induced gel crystallization of ultrahigh molecular weight poly(ethylene) (UHMW-PE) from a dilute xylene solution. After evaporation of the xylene, a microporous UHMW-PE film remains, which can serve as the support for liquid and polymeric ion-selective membranes. The addition of a membrane solvent and suitable receptor molecules to the xylene solution allows a one-step incorporation of these membrane components into the UHMW-PE support. The influence of the preparation conditions of the UHMW-PE support on the rates of the p-tert-butylcalix[4]arene tetraethylester-mediated transport of NaClO<sub>4</sub> was studied. Two concepts to improve the life-time of the membranes are introduced. In a first approach, the addition of photocrosslinkable nitril-substituted siloxane copolymers to the membrane phase has been evaluated. The enhanced viscosity of the membrane phase reduces leaching of carrier and solvent molecules from the membrane into the aqueous phases. In a second approach, the solvent is omitted and the membrane-phase merely consists of a benzo-15-crown-5 or calix[4]arene modified siloxane-copolymer, which is substituted to such a degree that ion transport no longer has to take place via diffusion of host-guest complexes but by jumping of the cations from one fixed carrier to a neighboring carrier
Original languageUndefined
Pages (from-to)383-394
JournalJournal of polymer science. Part B: Polymer physics
Volume36
Issue number36
Publication statusPublished - 1998

Keywords

  • METIS-105926
  • Polysiloxanes
  • gel crystallization
  • Ion-selective membranes
  • Crown ethers
  • Calixarenes
  • IR-10964

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