A series of new polymeric pseudo crown ethers contained many oxyethylenes have been synthesized by polycondensation of polyethylenglycol diphenyl ethers which was prepared by phenol and chlorides of polyethylenglycol with formaldehyde in the formic acid and in the presence of inorganic acid. The new monomers and polymers have been determined by IR

UV

1H-NMR

MS and element analysis.The complexing capacity

enrichment efficiemcy for metallic ions and thermostability of the polymeric crown ethers have also bbeen investigated. The results of the experiments indicated that all of the polymers can be used under 160℃ and that enrichment efficiemcy of the polymer-6 for K+

Pb2+

Ag+

Fe3+(10-6-10-4mmol/ml) is approximate to 100%. These polymeric false crown ethers can also be used in organic reactions as a phase transfer catalyst or absorption of NaBH4.