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- W2326006435 endingPage "9624" @default.
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- W2326006435 abstract "Two series of novel intrinsically microporous polyimides were synthesized from 9,9′-spirobifluorene-2,2′-diamine (SBF) and its bromine-substituted analogue 3,3′-dibromo-9,9′-spirobifluorene-2,2′-diamine (BSBF) with three different dianhydrides (6FDA, PMDA, and SPDA). All polymers exhibited high molecular weight, good solubility in common organic solvents, and high thermal stability. Bromine-substituted polyimides showed significantly increased gas permeabilities but slightly lower selectivities than the SBF-based polyimides. The CO2 permeability of PMDA–BSBF (693 Barrer) was 3.5 times as high as that of PMDA–SBF (197 Barrer), while its CO2/CH4 selectivity was similar (19 vs 22). Molecular simulations of PMDA–SBF and PMDA–BSBF repeat units indicate that the twist angle between the PMDA and fluorene plane changes from 0° in PMDA–SBF to 77.8° in PMDA–BSBF, which decreases the ability of the polymer to pack efficiently due to severe steric hindrance induced by the bromine side groups." @default.
- W2326006435 created "2016-06-24" @default.
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- W2326006435 date "2013-12-03" @default.
- W2326006435 modified "2023-09-25" @default.
- W2326006435 title "Novel Spirobifluorene- and Dibromospirobifluorene-Based Polyimides of Intrinsic Microporosity for Gas Separation Applications" @default.
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- W2326006435 doi "https://doi.org/10.1021/ma402033z" @default.
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