SUMMARY:Poly(enaminonitri1es) containing flexible alkyl ether units were prepared by reacting phis( 1 -chloro-2,2-dicyanovinyl)benzene with various a,~bis(4-aminophenoxy)alkanes in Nmethyl-2-pyrrolidone (NMP). All the polymers are soluble in polar aprotic solvents such as N,N-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), N,N-dimethylacetamide (DMAc) and NMP as well as in common organic solvents such as tetrahydrofuran and acetone. High molecular weight polymers possessing inherent viscosities in the range of 0.82-1.20 dL/g were obtained and tough films were cast from a DMF solution. They showed a large exotherm around 340°C attributable to the chemical changes of the dicyanovinyl group. Thermogravimetric analyses exhibited a good thermal stability with a 10% weight loss around 450°C and 73-8870 residual weight at 500°C under nitrogen.