High temperature resistant polyimide/polyethersulfone nano-fibers membrane for removal of PM

Air pollution is a recently global environmental problem due to rapidly industrial and economical activities, which results of serious threats to human's living environment and natural ecosystem. Fibrous membrane is a useful method to filter air pollution particles. Therefore, this study used Taguchi method to determine factors influence, while four factors included ratio of PI and PES, flow rate, voltage, and spinning time, for testing filter efficiency of electrospinning fiber. Spinning time of 20 min was defined as the best condition to generate the fibrous membrane with filter efficiency and quality of 99.54% and 5.56, and flow rate of 0.15 ml/h was the best condition to form the fibrous membrane with filter efficiency and quality of 93.84% and 0.88. Thermogravimetry and differential scanning calorimetry were used to conduct thermal analysis of nano-fiber membrane, and decomposed temperature of PI/PES was about 500 °C. Temperature of hot gas filtration usually occurred at the temperature of above 260 °C, such as 200–350 °C for waste incineration, 150–300 °C for concrete producing, and 171–210 °C for crematorium operation, so the PI/PES acquired potential advantage on application of hot gas filtration because of its high temperature resistance and high filter efficiency.