Sorption, swelling, and free volume of polybenzimidazole (PBI) and PBI/zeolitic imidazolate framework (ZIF-8) nano-composite membranes for pervaporation

Shi, Gui Min; Chen, Hongmin; Jean, Y. C.; Chung, Tai‐Shung

doi:10.1016/j.polymer.2012.11.056

Cited by 86 publications

(41 citation statements)

References 43 publications

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“…This indicates that the reaction of zinc with oxygen predominated at ∼400°C and the concomitant weight reduction was ascribed to the thermal degradation of the ZIF-8 structure due to the combustion of the organic moieties (i.e., mim). Although the high thermal stability of ZIF-8s up to ∼300−450°C under air 15,24,36 is often reported from TGA results and a similar conclusion can be drawn by referring to Figure S4, the corresponding XRD patterns in Figure 2 indicate that ZIF-8s were likely thermally stable up to ∼250°C following 2 d exposure. This result strongly suggests that ZIF-8s should be carefully used, especially under oxidative conditions, for example, in air.…”

Section: ■ Results and Discussionsupporting

confidence: 74%

“…Considering the fact that H 2 /CO 2 separations in the precombustion process are to be carried out under harsh conditions, 33 ZIF-8 should be thermally stable to be used effectively. In fact, the high thermal and chemical stabilities of ZIF-8 3 make this material suitable for the formation of homogeneous membranes, as ZIF-8s are believed to be thermally stable up to ∼450°C under air 15,24,35,36 and ∼550°C under N 2, 3 attracting their use under harsh operation conditions.…”

Section: ■ Introductionmentioning

confidence: 99%

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Thermosensitive Structural Changes and Adsorption Properties of Zeolitic Imidazolate Framework-8 (ZIF-8)

Lee¹,

Kim²,

Cho

et al. 2015

J. Phys. Chem. C

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We compared four types of ZIF-8 with varying sizes and shapes to determine their thermal-structural stability and derive appropriate thermal activation conditions and correlation between structural characteristics and adsorption properties. Under air, the ZIF-8 phase for all the samples was converted completely into the zinc oxide phase above ∼300°C, though thermalgravimetric analysis (TGA) indicated that the original structure was stable to ∼300−350°C. Longer exposures (∼30 d) suggested that thermal activation at ∼200°C was appropriate for the removal of guest and/or solvent molecules under air without structural damage. Despite no noticeable change in X-ray diffraction (XRD) patterns after activation at 250°C under air, the resulting BET surface areas and CO 2 adsorption amounts (at 1 bar and 30°C) of ZIF-8s were reduced to ∼44−54 and ∼72−87%, respectively, as compared to those of appropriately activated ZIF-8s. It appears that after the activation at 250°C under air, some Zn and N atoms were dissociated and converted to ZnOH and NOH, respectively, causing the partial structural damage of ZIF-8s.

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Section: ■ Results and Discussionsupporting

confidence: 74%

Section: ■ Introductionmentioning

confidence: 99%

Thermosensitive Structural Changes and Adsorption Properties of Zeolitic Imidazolate Framework-8 (ZIF-8)

Lee¹,

Kim²,

Cho

et al. 2015

J. Phys. Chem. C

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show abstract

“…It has been reported that small molecules in the polymer matrix would induced two contrary effects: swelling and fi lling. [ 25,26 ] In this regard, too much PEG loading may reduce the free volume available for transport by offsetting the benefi ts of swelling. In addition, the FFV, associated with both τ 3 and I 3 , shows a monotonically increment as the PEG loading increases, suggesting that the incorporation of PEG molecules would create additional free volume cavities in the polymer matrix.…”

Section: Resultsmentioning

confidence: 99%

PEG‐Imbedded PEO Membrane Developed by a Novel Highly Efficient Strategy Toward Superior Gas Transport Performance

Quan

Tang

Wang

et al. 2015

Macromol. Rapid Commun.

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Low-molecular-weight poly(ethylene glycol) (PEG) is deliberately incorporated into synthesized swellable poly(ethylene oxide) (PEO) membranes via a facile post-treatment strategy. The membranes exhibit both larger fractional free volume (FFV) and a higher content of CO2-philic building units, resulting in significant increments in both CO2 permeability and CO2/H2 selectivity. The separation performance correlates nicely with the microstructure of the membranes. This study may provide useful insights in the formation and mass transport behavior of highly efficient polymeric membranes applicable to clean energy purification and CO2 capture, and possibly bridge the material-induced technology gap between academia and industry.

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“…For example, the Chung group has reported the synthesis of ZIF-8/polybenzimidazole (PBI) mixed-matrix membranes for pervaporation dehydration of alcohols. 13 The Yang group reports the ZIF-8/polymethylphenylsiloxane (PMPS) for both pervaporation and vapor permeation of furfural. 14 Another hydrophobic ZIF material (ZIF-71) was incorporated into polyether-block-amide (PEBA) polymer for recovery of biobutanol.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hierarchical Micro/Mesoporous Structures via Solid–Aqueous Interface Growth: Zeolitic Imidazolate Framework-8 on Siliceous Mesocellular Foams for Enhanced Pervaporation of Water/Ethanol Mixtures

Sue

Chung

et al. 2014

ACS Appl. Mater. Interfaces

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A new hierarchical micro/mesoporous composite is synthesized via direct growth of microporous zeolitic imidazolate framework-8 (ZIF-8) on siliceous mesocellular foams (MCF). Depending on different synthetic conditions, ZIF-8 with two different particle sizes, i.e., ZIF-8 microparticles and ZIF-8 nanoparticles, were successfully formed on the external surface of amine-functionalized MCF (denoted as microZIF-8@MCF and nanoZIF-8@MCF, respectively). The synthesized hierarchical micro/mesoporous ZIF-8@MCF structures were characterized with several spectroscopic techniques including X-ray diffraction (XRD), solid-state NMR, and FT-IR and electron microscopic techniques (scanning electron microscope, SEM, and transmission electron microscopy, TEM). In addition, the pervaporation measurements of the liquid water/ethanol mixture show that nanoZIF-8@MCF/PVA (poly(vinyl alcohol) mixed-matrix membrane exhibits enhanced performance both on the permeability and separation factor. Compared to conventional routes for chemical etching, this study demonstrates a promising and simple strategy for synthesizing novel hierarchical porous composites exhibiting both advantages of mesoporous materials and microporous materials, which is expected to be useful for gas adsorption, separation, and catalysis.

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Sorption, swelling, and free volume of polybenzimidazole (PBI) and PBI/zeolitic imidazolate framework (ZIF-8) nano-composite membranes for pervaporation

Cited by 86 publications

References 43 publications

Thermosensitive Structural Changes and Adsorption Properties of Zeolitic Imidazolate Framework-8 (ZIF-8)

Thermosensitive Structural Changes and Adsorption Properties of Zeolitic Imidazolate Framework-8 (ZIF-8)

PEG‐Imbedded PEO Membrane Developed by a Novel Highly Efficient Strategy Toward Superior Gas Transport Performance

Synthesis of Hierarchical Micro/Mesoporous Structures via Solid–Aqueous Interface Growth: Zeolitic Imidazolate Framework-8 on Siliceous Mesocellular Foams for Enhanced Pervaporation of Water/Ethanol Mixtures

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