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synopsisHigh molecular weight poly(m-,pphenylene)4phenyl-1,2,~triazole has been prepared by the cyclocondensation reaction of aniline with high molecular weight poly(m-,p phenylene) hydrazide in polyphosphoric acid (PPA). It is proposed that the cyclocondensation reaction proceeds through the attack of "free" aniline on either or both of two intermediate substrate polymers (a polyhydraside phosphate and/or a protonated polyoxadiazole) to provide the desired polytriazole composition. The nature of the intermediate substrate polymer is determiped primarily by the reaction temperature. .Known model compounds containing the 4-phenyl-1,2,4-triazole ring were prepared from model hydrazide compounds under cyclocondensation reaction conditions to demonstrate the validity of this synthesis approach to the polytriazole8. Thermally stable fibers and f i l m s having maximum zero strength temperatures of 465 and 4O0C., respectively, have been prepared from formic acid solutions of poly(m~,pphenyiene)4-phenyl-l,2,4triazole. Thermogravimetric and differential thermal analyses of this polymer showed that the polymer was stable in nitrogen up to 512OC.

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