2015-Effect of methanol treatment on gas sorption and transport behavior of intrinsically microporous polyimide membranes incorporating Tr?ger?s base
作者：Jong Geun Seong, Yongbing Zhuang‖, Seungju Kim, Yu Seong Do, Won Hee Lee, Michael D. Guiver*, Young
關鍵字：Intrinsically Microporous Polyimide Membranes
論文來源：期刊
具體來源：Journal of membrane science
發(fā)表時間：2015年
The gas sorption behavior of polyimides (PIs) incorporating Tro¨ger?s
base (TB) units was investigated for five representative small gases (H2, N2, O2, CH4, and CO2) by barometric pressure decay methods at 35 °C.
Methanol treatment of the PI-TB membranes increased the sorption,
diffusion, and permeation of the small gas molecules because of
increased interactions between the polymer and gas molecules as well as
an increase of the FFV due to dilation of the polymers. Two
different solubility determination methods, pressure-decay based and
time-lag based methods, were introduced and compared. The gas
solubilities of relatively condensable gases such as CO2 and CH4
showed good agreement between the two solubility measurements. Two
different dianhydrides (6FDA and BTDA) in the PI-TBs were also
introduced to determine their structural contributions to the gas
sorption and transport properties. The two PI-TBs showed similar
behavior in Henry?s mode sorption. However, their Langmuir mode sorption
demonstrated distinctive behavior, resulting in different gas transport
phenomena. Methanol-treated PI-TB membranes exhibited plasticization
resistance for CO2 permeation under high CO2 content feed in CO2/CH4
mixture. Incorporating TB units in the PI backbones achieved comparable
microporosity and gas permeability results especially for CO2 separation in highly permeable polymer membranes.