Influence of UV radiation on structure and properties of polypropylene asymmetric solid-liquid separation membrane

Fluorescent UV lamps were chosen to treat the PP non-symmetric solid-liquid separation membrane and the ageing curve of the separation membrane at different temperatures were obtained. SEM,FT-IR,electronic fabric strength tester and contact angle measurement were used to study the separation membrane' s morphology,physical and mechanical properties and wetting performance. The results showed that the C O stretching vibration was found in polypropylene membrane surface which was handled at 45 ℃ for 1 d,indicating that the membrane surface began to be oxidized; after being treated at 45 ℃ for 6 d and at 60 ℃ for 4 d,the separation membrane's rupture strength retention rate were 2. 28% and 5. 81%,respectively,and all had lost their value in use,further,the membrane surface's hydrophilicity disappeared and the water conductivity decreased rapidly.