Abstract: The apparent kinetics of synthesizing of poly (phenylene sulfide) (PPS) fromp-dichlorobenzene and sodium sulfide has been investigated at 220℃ and 250℃ inN-methylpyrrolidone.The rates of sodium chloride generated and sodium sulfide consumedin a series of reaction time in polymerization reaction were determined and treated by meansof least-square method.It was found that the polycondensation process is dominated by acondensation reaction which, in turn, is followed by a self-polycondensation of ABtype(Eqs.2, 3).Thus an apparent kinetics expression of the polymerization was found as 1/(1-P_nacl+P_na2s)=_c0kt+11and the apparent rate constants of the two temperatures are 4.5×10^-4 3.0×10^-3respectively, and the apparent active energy was estimated as134 kJ/mol.

Key words: PPS, Condensation polymerization, p-Dichlorobenzene, Sodium sulfide, Apparent kinetics