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Polymer electrolyte membranes consisting of Cu(NO 3 ) 2  and poly(2-ethyl-2-oxazoline) (POZ) were prepared for SF 6 /N 2  separation. It was anticipated that repulsive forces would be operative between the negative charge of water and the F atoms of SF 6  when Cu(NO 3 ) 2  in the composite was solvated by water, and that the barrier effect of Cu 2+  ions would be activated. In fact, Cu(NO 3 ) 2  solvated by water in the POZ membrane was observed to have more higher-order ionic aggregates than free ions or ion pairs, as confirmed by FT-Raman spectroscopy. Thus, when Cu(NO 3 ) 2  solvated by water was incorporated into the POZ matrix, the N 2 /SF 6  selectivity increased to 28.0 with a N 2  permeance of 11.2 GPU at a POZ/Cu(NO 3 ) 2  mole ratio of 1:0.7. The coordinative interaction of Cu(NO 3 ) 2  with the carbonyl group in POZ was confirmed by FT-IR spectroscopy and TGA, and the film thickness of the membrane was determined from SEM analysis.

Highly selective polymer electrolyte membranes consisting of poly(2-ethyl-2-oxazoline) and Cu(NO3)2 for SF6 separation