For the improvement of molecular weight of poly(phenylene sulfide), PPS, copolymerization method and phase transfer catalyst as additive were investigated. As a preliminary experiment the optimum homopolymerization conditions of PPS from p-dichlorobenzene(DCB) and Na₂S·9H₂O and poly(phenylene sulfide/sulfone), PPSS from 4-chlorophenylsulfone(CPS) and Na₂S·9H₂O were examined. The use of minor amount of CPS comonomer with DCB in a coupling type reaction was found to give higher molecular weight polymer than direct copolymerization or homopolymerization of PPS. The addition of 1/50 amount of phase transfer catalysts such as 15-crown-5, 18-crown-6, dibenzo 18-crown-6, dicyclohexano 18-crown-6 based on sodium sulfide also improved the molecular weight of PPS. The effect, however, was not so great as that of lithium acetate added equimolar amount of Na₂S·9H₂O into NMP solvent.

Poly(phenylene sulfide), PPS의 고분자량화를 위하여 공중합법 및 상전이 촉매 효과를 조사하였다. 먼저 sodium sulfide(Na₂S·9H₂O)를 p-dichlorobenzene(DCB)와 중합시켜 PPS를 그리고 4-chlorophenylsulfone(CPS)와 중합시켜 poly(phenylene sulfide/sulfone), PPSS를 얻는 단독중합 조건에 대해 조사하였다. 소량의 CPS를 DCB와 직접 공중합하기 보다 coupling 반응을 통하여 PPS의 분자량을 증가시킬 수 있음을 알았다. 또 crown ether들을 상전이 촉매로 사용할 때 PPS의 분자량이 증가함을 확인하였으나 그 효과는 lithium acetate 첨가제를 NMP 용매에 투입할 때 보다 크지 않음을 알 수 있었다.

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