N-undecenyl and N-allyl benzo-aza-15-crown-5 were subjected to hydrosilylation with methyldichlorosilane, followed by polycondensation with silanol-terminated polydimethylsiloxane to give the crown functionalized linear polysiloxanes. Studies were reported of the variation of cation transport rate through a bulk liquid membrane containing crown functionalized linear polysiloxanes with the kind of polysiloxanes, cation and anion thpe, and with carrier concentration, salt concentration. The stability of the membrane was also investigated.

Key words: STABILITY, LIQUID MEMBRANE, POLYSILOXANE, CROWN ETHER, ION CARRIER