A study has been made of the formation of membranes from solutions of poly(2,6-dimethyl-1,4-phenylene oxide) (P.P.O.**) In trichloroethylene/alcohol mixtures and using methanol as the precipitatron agent. The mechanrsm of the formation of the sponge -like structures proves to be a liquid -liquid phaseseparatianphenomenon with nucleation and growth of the diluted phase_ The waterpermeablllty of thrs extremely hydrophobic polymer membrane (which only 1s obtained fbr high percentages of octanol in the polymer solutlon) is possibly due to crystallization In the concentrated polymer regions, like the skin at the surface and the concentrated polymer phase which forms the matrix of the sponge-structure. The membranes prepared show good ultrafiltration properties. asymmetric ultrafiltration membranes of poly(2,6-dimethyl-2,4phenylene oxide) (P.P.O.) by means of the so called coagulation technique.
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