作者：Jong Geun Seong, Yongbing Zhuang‖, Seungju Kim, Yu Seong Do, Won Hee Lee, Michael D. Guiver*, Young
关键字：Intrinsically Microporous Polyimide Membranes
论文来源：期刊
具体来源：Journal of membrane science
发表时间：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.