[{"id":"cmoqf1fxg0000l4yrtjvgwh3g","createdAt":"2026-05-03T23:42:48.293Z","updatedAt":"2026-05-03T23:43:24.500Z","title":"Intrinsically microporous co-polyimides derived from ortho-substituted Tröger's Base diamine with a pendant tert-butyl-phenyl group and their gas separation performance","authors":"Xiaofan Hua, Yabing He, Zhen Wang, Jingling Yan","year":2018,"journal":"Polymer","doi":"10.1016/j.polymer.2018.08.013","polymerName":"6FDA/TTBDA/TBDA2 co-polyimides (TB-PIMPIs)","polymerFamily":"PIM/Polyimide","filmType":"dense","functionalGroup":"Tröger's Base, tert-butyl-phenyl, hexafluoroisopropylidene, methyl","ladderOrLinear":"other","fabricationMethod":"one-step polycondensation followed by solution-casting","castingSolvent":"CHCl3","thicknessUm":null,"pretreatment":"immersed in methanol for one day, then dried at 130 °C under vacuum for one day","annealingCondition":"dried at 120 °C for 12 h under vacuum (after casting), then at 130 °C under vacuum for one day (before test)","gasPair":"O2/N2, CO2/CH4, CO2/N2","measurementType":"permeability","temperatureC":null,"pressureBar":null,"pureOrMixed":"pure-gas","humidityInfo":null,"permeabilityA":null,"permeabilityB":null,"selectivity":null,"unitOriginal":null,"unitNormalized":null,"agingTimeDay":null,"plasticizationInfo":null,"mixedGasResult":null,"betSurfaceArea":null,"dSpacing":null,"tg":null,"ffv":null,"density":null,"notes":"The co-polyimides exhibited a more contorted chain conformation and higher chain stiffness compared to 6FDA/TBDA2. With a TTBDA percentage of > 50%, the copolymers showed higher BET surface area, fractional free volume, total pore volume, and interchain distance. The ultra-micropore width (0.8–0.9 nm) was less than that of 6FDA/TBDA2 due to space-filling and pore-partitioning effects of tert-butyl-phenyl groups, leading to enhanced gas separation performance and higher diffusion selectivity.","evidenceSnippet":"Title: Intrinsically microporous co-polyimides derived from ortho-substituted Tröger's Base diamine with a pendant tert-butyl-phenyl group and their gas separation performance\nAuthors: Xiaofan Hua,b, Yabing Hec, Zhen Wanga,∗, Jingling Yana,d,∗∗\nYear/Journal: Polymer 153 (2018) 173–182\nDOI: https://doi.org/10.1016/j.polymer.2018.08.013\nPolymer Name & Family: TB-containing intrinsically microporous co-polyimides (TB-PIMPIs)... The one-step polymerization of 4,4'-(hexafluoroisopropylidene)diphthalic anhydride (6FDA), TTBDA, and 3,9-diamino-4,10dimethyl-6,12-dihydro-5,11-methanodibenzo[b,f][1,5]diazocine (TBDA2) afforded TB-containing intrinsically microporous co-polyimides (TB-PIMPIs).\nFilm Type: First, a polymer solution in CHCl3 (3 wt%) was filtered through 0.45 μm PTFE filters, and poured into a Teflon mold. CHCl3 was slowly evaporated at 23 °C for 72 h.\nFunctional Group: ortho-substituted Tröger's Base (TB) diamine with a pendant tert-butyl-phenyl group... hexafluoroisopropylidene)diphthalic anhydride (6FDA)... 3,9-diamino-4,10dimethyl-6,12-dihydro-5,11-methanodibenzo[b,f][1,5]diazocine (TBDA2)\nLadder or Linear: Molecular modeling results revealed that compared with 6FDA/TBDA2, 6FDA/TTBDA exhibited a more contorted chain conformation and higher chain stiffness.\nFabrication Method: TB-PIMPIs were prepared by the polymerization of TBDA2, TTBDA and 6FDA... The resultant polymer solution was precipitated into ethanol... Film formation: First, a polymer solution in CHCl3 (3 wt%) was filtered through 0.45 μm PTFE filters, and poured into a Teflon mold.\nCasting Solvent: First, a polymer solution in CHCl3 (3 wt%) was filtered... m-cresol (7.08 g) were combined... for polymerization.\nPretreatment: Next, the membrane was immersed in methanol for one day and dried at 130 °C under vacuum for one day before subjected to gas permeability test [73].\nAnnealing Condition: The membrane was subsequently dried at 120 °C for 12 h under vacuum to evaporate residual solvent.\nGas Pair: All copolyimides showed better gas separation performance in terms of the permeability/selectivity trade-off of O2/N2, CO2/CH4, and CO2/N2.\nMeasurement Type & Pure/Mixed: Pure gas permeability (P) was measured using a PERME VAC-2 permeation system (Labthink Inst...\nNotes: Compared with 6FDA/TBDA2, 6FDA/TTBDA exhibited a more contorted chain conformation and higher chain stiffness. As a result, with a TTBDA percentage of > 50%, the copolymers exhibited a higher Brunauer-Emmet-Teller surface area, fractional free volume, total pore volume, and interchain distance compared with 6FDA/TBDA2. On the other hand, the ultra-micropores width (0.8–0.9 nm) of the copolyimides was less than that of 6FDA/TBDA2 because of the space-filling and pore-partitioning effects of the tert-butyl-phenyl groups. The combination of higher pore volumes and smaller ultra-micropores in the copolymers induced a more efficient molecular gas-sieving effect and thus higher diffusion selectivity.","extractionConfidence":0.8,"needsReview":true,"reviewedBy":null,"reviewedAt":null,"pdfUrl":"https://membrane-copilot-uploads-569022535078.s3.us-east-1.amazonaws.com/papers/1777851766303-1-s2.0-S0032386118307146-main.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIAYI7DC2WTEMPNXN46%2F20260503%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260503T234248Z&X-Amz-Expires=3600&X-Amz-Signature=79b453989a877eaf9ed9af74aa4b7fafe88f1713ccd40df44d2faa6b402ba246&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject","sourceTag":"ai-extracted"},{"id":"cmoqehjic00005847pjin05s0","createdAt":"2026-05-03T23:27:19.800Z","updatedAt":"2026-05-04T02:35:06.903Z","title":"Finely tuning the microporosity in phosphoric acid doped triptycene-containing polybenzimidazole membranes for highly permselective helium and hydrogen recovery","authors":"Yang Jiaoa,b, Mengdi Liu c, Qi Wua,b, Peijun Zhengd, Wei Xu e, Bangjiao Yee, Hongjun Zhang e, Ruilan Guoc,**, Shuangjiang Luod,*","year":2023,"journal":"Journal of Membrane Science","doi":"10.1016/j.memsci.2023.121474","polymerName":"TPBI-(H3PO4)0.98","polymerFamily":"PBI","filmType":null,"functionalGroup":"triptycene, phosphoric acid, imidazole ring","ladderOrLinear":"ladder","fabricationMethod":"solution casting, immersion doping","castingSolvent":"DMAc","thicknessUm":25,"pretreatment":"dried under vacuum at 170 °C for 4 h (for TPBI film)","annealingCondition":"dried under vacuum at 170 °C for 4 h (for TPBI film), dried in vacuum oven at 110 °C for 4 h (for composite membrane)","gasPair":"H2/CO2","measurementType":"gas separation performance","temperatureC":150,"pressureBar":0,"pureOrMixed":"mixed-gas","humidityInfo":null,"permeabilityA":46.7,"permeabilityB":0,"selectivity":16,"unitOriginal":"Barrer","unitNormalized":"Barrer","agingTimeDay":0,"plasticizationInfo":null,"mixedGasResult":null,"betSurfaceArea":0,"dSpacing":0,"tg":0,"ffv":0,"density":0,"notes":"far beyond the Robeson’s 2008 upper bound for H2/CO2 separation","evidenceSnippet":"Additionally, under mixed-gas conditions at 150 ◦C, the TPBI-(H3PO4)0.98 membrane displays a H2 permeability of 46.7 Barrer and a H2/CO2 selectivity of 16, far beyond the Robeson’s 2008 upper bound for H2/CO2 separation. The TPBI-PA composite membranes were fabricated by immersing the TPBI films (~25 μm) in PA/methanol solutions. Dense TPBI membranes were obtained by the solution casting method. Specifically, 0.6 g of TPBI was entirely dissolved in 10 mL DMAc and filtered with a 0.45 μm syringe filter to eliminate any undissolved polymers or dust. The solution was cast onto a clean and predried glass plate and heated using an infrared lamp at 60 ◦C for 14 h. The isotropic film was obtained and peeled off from the glass plate, and the film was further dried under vacuum at 170 ◦C for 4 h to evaporate the residual solvent completely. The solution was stirred for 20 h and then dried in a vacuum oven at 110 ◦C for 4 h.","extractionConfidence":1,"needsReview":false,"reviewedBy":null,"reviewedAt":"2026-05-03T23:28:52.021Z","pdfUrl":"https://membrane-copilot-uploads-569022535078.s3.us-east-1.amazonaws.com/papers/1777850838062-22.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIAYI7DC2WTEMPNXN46%2F20260503%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260503T232719Z&X-Amz-Expires=3600&X-Amz-Signature=dea0fac2cd9e21b9ae6ab6df223b988cab679d21e0e0bfcdcb0b798f3cdf38fb&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject","sourceTag":"ai-extracted"},{"id":"cmoqe967z000014bh21i9mo50","createdAt":"2026-05-03T23:20:49.342Z","updatedAt":"2026-05-03T23:21:10.128Z","title":"Processing: 22.pdf","authors":null,"year":null,"journal":null,"doi":null,"polymerName":null,"polymerFamily":null,"filmType":null,"functionalGroup":null,"ladderOrLinear":null,"fabricationMethod":null,"castingSolvent":null,"thicknessUm":null,"pretreatment":null,"annealingCondition":null,"gasPair":null,"measurementType":null,"temperatureC":null,"pressureBar":null,"pureOrMixed":null,"humidityInfo":null,"permeabilityA":null,"permeabilityB":null,"selectivity":null,"unitOriginal":null,"unitNormalized":null,"agingTimeDay":null,"plasticizationInfo":null,"mixedGasResult":null,"betSurfaceArea":null,"dSpacing":null,"tg":null,"ffv":null,"density":null,"notes":"FAILED: An error occurred (ThrottlingException) when calling the InvokeModel operation (reached max retries: 4): Too many tokens per day, please wait before trying again.","evidenceSnippet":null,"extractionConfidence":null,"needsReview":true,"reviewedBy":null,"reviewedAt":null,"pdfUrl":"https://membrane-copilot-uploads-569022535078.s3.us-east-1.amazonaws.com/papers/1777850444243-22.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Content-Sha256=UNSIGNED-PAYLOAD&X-Amz-Credential=AKIAYI7DC2WTEMPNXN46%2F20260503%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260503T232049Z&X-Amz-Expires=3600&X-Amz-Signature=8864ef4fcca4cd65930cdf7fed800db5bf4a9c82d08f55ba3f910916502f9509&X-Amz-SignedHeaders=host&x-amz-checksum-mode=ENABLED&x-id=GetObject","sourceTag":"ai-extracted"}]