Substituted triazine-capped polyphenylene ethers

A substituted alkoxy or alkylthiotriazine-capped polyphenylene ether having end groups of the formula ##STR13## wherein:

• each Q.sup.1 is independently halogen, primary or secondary lower alkyl, phenyl, haloalkyl, aminoalkyl, hydrocarbonxy, or halohydrocarbonxy wherein two or more carbon atoms separate the halogen and oxygen atoms;
• each Q.sup.2 is independently hydrogen, halogen, primary or secondary lower alkyl, phenyl, haloalkyl, hydrocarbonoxy or halohydrocarbonoxy as defined for Q.sup.1 ;
• X.sup.1 is an alkyl, cycloalkyl or aromatic radical or ##STR14## X.sup.2 is chlorine, bromine, iodine, alkylsulfonate, arylsulfonate, carboxylate, phosphate, phosphonate, phosphinate, thiophosphate, thiophosphonate or thiophosphinate;
• each Z is independently oxygen or sulfur;
• each R.sup.1 is independently hydrogen, C.sub.1-4 primary or secondary alkyl, acyl, nitro, alkylsulfoxy or alkylsulfone;
• R.sup.2 is a C.sub.1-3 alkylene radical which is unsubstituted or is substituted with moieties selected from the group consisting of C.sub.1-4 primary or secondary alkyl radicals and non-hydrocarbon substituents as defined for R.sup.1 ;
• each R.sup.3 is independently R.sup.1 or X.sup.2 ;
• m is 0 or 1;
• and
• n is 1-3.