Poly(phenylene sulfide) (PPS) films prepared by melt-pressing of PPS resin were irradiated with UV light of 315 nm at 40 oC for up to 24 h and the effects of UV irradiation on the structure and properties of PPS were analyzed by FTIR spectroscope, spectroscopic colorimeter, X-ray photoemission spectroscope, differential scanning calorimeter, and universal testing machine. As UV irradiation time increased, the color of PPS film gradually changed to brown. The UV irradiation on PPS film resulted in the formation of new functional groups and cross-linking, and increased oxygen atom content due to photo-oxidation. The breaking tensile stress of PPS film after UV irradiation decreased with increasing UV irradiation time. Both the cold and melt crystallization temperature of the UV irradiated PPS were similar to those of un-irradiated one, while the heat of melting and melt crystallization were decreased. The addition of HALS3 (hindered amine light stabilizer 3) to PPS film significantly suppressed the cross-linking and formation of new functional groups owing to UV irradiation and thus reduced both the color change and decrease in breaking tensile stress.

폴리(페닐렌 설파이드) (PPS) 수지를 용융압착시켜 제조한 PPS 필름에 40 oC에서 315 nm의 자외선(UV)을 24시간까지 조사시키고, UV 조사가 PPS의 구조와 물성에 미치는 영향을 FTIR 분광분석기, 분광 측색기, X-선 광전자 분광분석기, 시차주사열량계, 만능시험기로 분석하였다. UV 조사시간이 길어지면 PPS 필름은 점차 갈색으로 변하였다. UV 조사는 PPS 필름에 새로운 관능기와 가교가 생성되게 하였으며, 광산화에 의해 시료의 산소원자 함량이 증가하였다. UV 조사된 PPS의 냉결정화와 용융결정화 온도는 미조사 시료와 비슷하였으나 용융열과 용융결정화열은 감소하였다. HALS3(입체장애 아민 광안정제 3)을 PPS에 첨가하면 UV 조사에 의해 생성되는 가교와 새로운 관능기 생성을 억제하였으며, 이에 따라 색 변화와 파단인장응력 감소를 크게 줄였다.

Keywords: poly(phenylene sulfide), UV irradiation, HALS3, structure and property change, color difference