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. 2022 Mar 9;8(10):eabl8160. doi: 10.1126/sciadv.abl8160

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Fig. 3. — (A) WXRD patterns, (B) density at 23°C and FFV at 23° and 150°C, and (C) pure-gas H₂/CO₂ separation properties; (D) CO₂ and C₂H₆ sorption isotherms of PBI and PBI-PPA_0.34. The curves are the best fits of Eq. 2 with the values of the adjustable parameters recorded in table S5. a.u., arbitrary units.