SYNTHESIS OF THIOL-TERMINATED AND CARBOXYL-TERMINATED POLY(P-PHENYLENE SULFIDE) OLIGOMERS

Poly(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, temp erature, and monomer ratio on end groups and molecular weight of PPS o ligomers 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 wi th equimolar SS followed by the reaction with an extra amount of SS. T he 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 p reparation of thiol-terminated PPS oligomers. Carboxyl-terminated PPS telechelic oligomers were produced through the reaction of thiol-termi nated PPS oligomers with p-chlorobenzoic acid.