Hydrophilic polyphosphazenes were synthesized from hydrophobic polyphosphazenes by adding methoxyethylenoxy side chains and cast by dip-coating method into membranes supported on porous polypropylene mesh filter sheet for metal separation testing. A solution of Cr3+, Co2+, Mn2+nitrates was used in diffusion experiments which were conducted from 25℃ to 60℃. It was found that the ion transport properties were increased as the repeating number of ethylenoxy side chain increased. Membrane from trifluoroethoxy methoxyethoxyethoxyethoxy co-substituted polyphosphazenes was found to separate Cr3+ion from Mn2+and Co2+ions with separation factor of 4.5 at 60℃.

소수성인 poly[bis(trifluoroethoxy)phosphazene]에 methoxyethylenoxy 측쇄를 치환시켜 친수성을 증가시킨 포스파젠 고분자를 합성하였으며 합성된 고분자를 다공성 polypropylene 지지체위에 dip-coating법으로 금속이온 분리막을 제조하였다. Cr3+, Co2+, Mn2+이온 수용액에 대한 분리실험을 25℃에서 60℃까지 온도범위에서 행하였다. 치환된 methoxyethylenoxy기 중의 ethylenoxy의 반복단위가 증가할수록 이온의 투과특성이 증가하는 것을 알 수 있었다. Trifluoroethoxy methoxyethoxyethoxyethoxy co-substituted polyphosphazene의 경우 Cr3+이온의 60℃에서 분리계수 4.5의 값을 갖고 Co2+, Mn2+이온들로부터 분리가 됨을 알 수 있었다.