Abstract:The polyampholyte,ampholytic polyphenylene sulfide were prepared via sulfonation reaction,bromination reaction and substitution reaction between bromide and quaternary ammonium group or tertiary amine group.The degree of sulfonation and the contents of bromide were investigated by acid base titration and Mohr method,respectively,and the structure of these polymers was characterized by IR and UV-vis measurement.The results indicated that sulfonation degree of polyphenylene sulfide could be up to 47.6% under the best conditions,i.e.,the ratio of oleum to PPS was 1∶ 15(g/mL),reaction temperature was 105℃ and reaction time was 4 h.The content of bromide was 28.20% when the dosage of FeCl3 was 4%,the reaction time was 4 h,and the reaction temperature was 40℃.Bromine on the benzene ring was substituted by quaternary ammonium group and tertiary amine group.Through analysis of IR and UV-vis spectrum,it could be speculated that the modification of polyphenylene sulfide was successful and the polyampholyte was obtained.