High Temperature Gas Separations Using High Performance Polymers

Klaehn, John R.; Orme, Christopher J.; Peterson, Eric S.; Stewart, Frederick F.; Urban-Klaehn, Jagoda M.

doi:10.1016/b978-0-444-53728-7.00013-6

Cited by 10 publications

(14 citation statements)

References 24 publications

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“…PBIs are known for their low solubility and are generally only soluble in aprotic or strong acid solvents . Several attempts to increase the solubility of PBI‐type polymers have been made by incorporation of soluble linkages, functionalities, and copolymerizations . In this work, the effects of randomization of the benzimidazole sequence on solubility were examined.…”

Section: Resultsmentioning

confidence: 99%

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

Gulledge

Chen

Benicewicz

2013

J. Polym. Sci. Part A: Polym. Chem.

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In the present work, a unique series of random polybenzimidazole (PBI) copolymers consisting of the recently reported novel isomeric AB‐PBI (i‐AB‐PBI) and the well known AB‐PBI were synthesized. The i‐AB‐PBI incorporates additional linkages (2,2 and 5,5) in the benzimidazole sequence when compared with AB‐PBI. Random copolymers, varying in composition at 10 mol % increments, were synthesized to evaluate the effects of sequence isomerism in the polymer main chain without altering the fundamental chemical composition or functionality of a polymer chain consisting of 2,5‐benzimidazole units. Polymer solutions were prepared in polyphosphoric acid (PPA) and cast into membranes using the sol–gel PPA process. The resulting polymers were found to have high inherent viscosities (>2.0 dL/g) and showed elevated membrane proton conductivities (∼0.2 S/cm) under anhydrous conditions at 180 °C. Fuel cell performance evaluations were conducted, and an average output voltage ranging from 0.5 to 0.60 V at 0.2 A/cm2 was observed for hydrogen/air at an operational temperature of 180 °C without applied backpressure or humidification. Herein, we report for the first time glass transition (Tg) temperatures for AB‐PBI, i‐AB‐PBI, and an anomalous Tg effect for the series of randomized PBIs. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 619–628

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Section: Resultsmentioning

confidence: 99%

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

Gulledge

Chen

Benicewicz

2013

J. Polym. Sci. Part A: Polym. Chem.

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“…The higher physicochemical stability was attributed mainly to the entire covalent bonding nature of polymers as compared to MOFs (Dawson et al 2011) and therefore can be considered seriously for CO 2 adsorption at elevated pressures. PBI has been considered as one of the best HP polymers (Klaehn et al 2011) which has very high thermal stability, mechanically robust molecular nature and tunable mesoporous structure (Lobato et al 2010;Kumbharkar and Li 2012). Recent simulation study on pre-combustion CO 2 has suggested that PBI based membrane is more advantageous than commonly used Selexol TM CO 2 capture process due to the lower regeneration energy cost ).…”

Section: Introductionmentioning

confidence: 98%

Synthesis, characterization and evaluation of porous polybenzimidazole materials for CO2 adsorption at high pressures

et al. 2016

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Porous polybenzimidazole polymers have been under investigation for high and low pressure CO 2 adsorption due to the well-built stability under high pressure and at various temperatures. Pressure swing and temperature swing processes like integrated gasification combined cycle require materials which can operate efficiently at high pressure and high temperature and can remove CO 2 . In this manuscript we report synthesis, characterization and evaluation of two polybenzimidazole materials (PBI-1 and PBI-2), which were prepared with two different solvents and different cross-linking agents by condensation techniques. Low and high pressure CO 2 sorption characteristic of both the materials were evaluated at 273 and 298 K. Thermal gravimetric analysis showed high temperature stability up to 500°C for the studied materials. PBI-1 has shown very good performance by adsorbing 3 times more (1.8025 mmolg -1 of CO 2 ) than PBI-2 at 0°C and at low pressures. Despite low surface area results obtained via BET techniques, at 50 bars PBI-1 adsorbed up to 6.08 mmolg -1 of CO 2 . Studied materials have shown flexible behavior under applied pressure that leads to so-called ''gate-opening'' adsorption behavior and it makes these materials promising adsorbents of CO 2 at high pressures and it is discussed in the manuscript in detail.

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“…Polymeric membranes with better chemical and thermal stability would extend the applications to conditions currently only covered by ceramics [8], keeping the advantages in their manufacture and module characteristics. High performance polymers are available with stability at temperatures even higher than 400 o C [9,10].…”

Section: Introductionmentioning

confidence: 99%

Porous polymeric membranes with thermal and solvent resistance

Pulido

Waldron

Zolotukhin

et al. 2017

Journal of Membrane Science

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Polymeric membranes are highly advantageous over their ceramic counterparts in terms of the simplicity of the manufacturing process, cost and scalability. Their main disadvantages are low stability at temperatures above 200 ˚C, and in organic solvents. We report for the first time porous polymeric membranes manufactured from poly(oxindolebiphenylylene) (POXI), a polymer with thermal stability as high as 500 ˚C in oxidative conditions. The membranes were prepared by solution casting and phase inversion by immersion in water. The asymmetric porous morphology was characterized by scanning electronic microscopy. The pristine membranes are stable in alcohols, acetone, acetonitrile and hexane, as well as in aqueous solutions with pH between 0 and 14. The membrane stability was extended for application in other organic solvents by crosslinking, using various dibromides, and the efficiency of the different crosslinkers was evaluated by thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS). POXI crosslinked membranes are stable up to 329 ˚C in oxidative conditions and showed organic solvent resistance in polar aprotic solvents with 99% rejection of Red Direct 80 in DMF at 70 ˚C. With this development, the application of polymeric membranes could be extended to high temperature and harsh environments, fields currently dominated by ceramic membranes.

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High Temperature Gas Separations Using High Performance Polymers

Cited by 10 publications

References 24 publications

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

Investigation of sequence isomer effects in AB-polybenzimidazole polymers

Synthesis, characterization and evaluation of porous polybenzimidazole materials for CO2 adsorption at high pressures

Porous polymeric membranes with thermal and solvent resistance

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