Bifunctionalized Intrinsically Microporous Polyimides with Simultaneously Enhanced Gas Permeability and Selectivity.
作者： Xiaohua Ma , Mohsin Mukaddam , Ingo Pinnau
关键词: Diffusion 、 Barrer 、 Chemistry 、 Gas separation 、 Polymer chemistry 、 Condensation reaction 、 Permeability (electromagnetism) 、 Selectivity 、 Microporous material 、 Diamine
摘要: Two novel intrinsically microporous copolyimides synthesized by condensation reaction of 4,4'-(hexafluoroisopropylidene) diphthalic anhydride (6FDA), 3,3,3',3'-tetramethyl-1,1'-spirobisindane-5,5'-diamino-6,6'-diol, and 3,5-diaminobenzoic acid with diamine ratios 80/20 (Co-80/20) 50/50 (Co-50/50) are reported. Unexpectedly, the Co-80/20 not only demonstrates higher microporosity (300 m(2) g(-1) ) than PIM-6FDA-OH homopolymer (190 but also exhibits simultaneously enhanced CO2 permeability (from 119 to 171 Barrer) /CH4 selectivity 35 41) after thermal annealing at 250 °C. This originates from diffusivity (D results its increased diffusion /D CH4 ). After crosslinking 300 °C, an even (261 almost unchanged selectivity.
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