Synthesis of thiol‐ and carboxyl‐terminated poly(p‐phenylene sulfide) oligomers

Abstract

AbstractPoly(p‐phenylene sulfide) (PPS) oligomers were synthesized from sodium sulfide (SS) and p‐dichlorobenzene (p‐DCB) in hexamethylphosphoramide (HMPA) under atmospheric pressure. The effects of reaction time, temperature, and monomer ratio on end groups and molecular weight of PPS oligomers were investigated. The results show that the molecular weight is controlled by the above parameters. Thiol‐terminated PPS oligomers were prepared by two routes. One was the polycondensation of p‐DCB with equimolar SS followed by the reaction with an extra amount of SS. The other was the depolymerization of high molecular weight PPS with SS in HMPA. The results show that the second route is the best one for preparation of thiol‐terminated PPS oligomers. Carboxylterminated PPS telechelic oligomers were produced through the reaction of thiol‐terminated PPS oligomers with p‐chlorobenzoic acid.