Selectivity enhancement via photooxidative surface modification of polyimide air separation membranes

Meier, Ingrid K.; Langsam, Michael; Klotz, Herber C.

doi:10.1016/0376-7388(93)e0174-i

Cited by 31 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various approaches to exceed the upper bound have been explored, including surface modification (31,32), facilitated transport (33), phaseseparated polymer blends (34), and mixed-matrix membranes (MMMs) (35). Although the upperbound concept as originally formulated only applies to homogeneous polymer membranes, comparing permeability and selectivity data on upperbound plots remains a popular way to gauge membrane material performance.…”

Section: Origin Of the Permeability-selectivity Trade-offmentioning

confidence: 99%

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Park

Kamcev

Robeson

et al. 2017

Science

2,317

1,530

View full text Add to dashboard Cite

Increasing demands for energy-efficient separations in applications ranging from water purification to petroleum refining, chemicals production, and carbon capture have stimulated a vigorous search for novel, high-performance separation membranes. Synthetic membranes suffer a ubiquitous, pernicious trade-off: highly permeable membranes lack selectivity and vice versa. However, materials with both high permeability and high selectivity are beginning to emerge. For example, design features from biological membranes have been applied to break the permeability-selectivity trade-off. We review the basis for the permeability-selectivity trade-off, state-of-the-art approaches to membrane materials design to overcome the trade-off, and factors other than permeability and selectivity that govern membrane performance and, in turn, influence membrane design.

show abstract

Section: Origin Of the Permeability-selectivity Trade-offmentioning

confidence: 99%

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Park

Kamcev

Robeson

et al. 2017

Science

2,317

1,530

View full text Add to dashboard Cite

show abstract

“…However, a trade-off relationship exists between the degree of cross-linking and gas permeability. The excessive cross-linking density of polymer membranes improves gas selectivity but significantly reduces gas permeability because of membrane densification [10,11,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and gas transport properties of UV-cured low-viscosity fluorine-containing telechelic polyimide membranes

Shindo

Yokouchi

Shirokura

et al. 2013

Desalination and Water Treatment

View full text Add to dashboard Cite

A novel ultraviolet (UV) cross-linking method using fluorine-containing telechelic polyimide membranes was investigated. The base fluorine-containing polyimide was synthesized by polycondensation using the monomers, 4,4´-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,3,5,6-tetramethyl-1,4-phenylene diamine (TeMPD). Both chain ends of the 6FDA-TeMPD polyimide were end-capped with either UV-reacted groups, 1,1-bis(acryloyloxy methyl) ethyl isocyanate (BEI) group or p-aminostyrene (PAS) group. The two types of telechelic polyimide membranes, 6FDA-TeMPD-BEI and 6FDA-TeMPD-PAS, were formed with UV irradiation from the low-viscosity solutions using the solvent-casting method. The base polyimide membrane was soluble in tetrahydrofuran, whereas both UV-cured telechelic polyimide membranes were partly insoluble in it. This result suggested that both telechelic polyimides reacted at the polymer chain ends through UV irradiation. The density values of the UV-cured membranes were almost the same. Thus, this cross-linking method could prevent significant membrane densification compared with other conventional cross-linking methods. As the UV irradiation time increased, the gas selectivity in both UV-cured polyimide membranes increased without a significant decrease in gas permeability. The increase in ideal gas selectivity was attributed to the increase in the gas diffusivity selectivity rather than the solubility selectivity.

show abstract

“…Although many crosslink reactions for gas separation membranes have been reported, the degree of crosslinking is a tradeoff with gas permeability. The excessive crosslinking density of polymer membranes improves gas selectivity but significantly reduces gas permeability because of membrane densification . This study hypothesizes that the use of telechelic polymers effectively forms crosslink structure at the polymer chain ends.…”

Section: Introductionmentioning

confidence: 88%

Characterization and gas permeation properties of UV-cured fluorine-containing telechelic polyimide membranes with a crosslinker

et al. 2013

View full text Add to dashboard Cite

The characterization and gas permeation properties of ultraviolet (UV)‐cured fluorine‐containing telechelic polyimide membranes and end‐capped with a crosslinker with acryloyl groups were investigated. Membrane formation property was improved by the addition of crosslinker by using UV irradiation. The densities of UV‐cured membranes were almost similar to each other, and high gel fraction was shown on the UV‐cured membranes. This result suggests that the crosslinker promotes crosslink reaction at the polymer chain ends and does not induce appreciable membrane densification. Furthermore, the gas permeability of the UV‐cured membranes was higher than that of the membrane without the crosslinker. The higher gas permeability is due to the new crosslink structure formed at the polymer chain ends, which was promoted by the crosslinker after UV irradiation, but did not induce appreciable membrane densification. The use of a BEI crosslinker in the telechelic polyimide membranes promoted the crosslink reaction and increased the H2 selectivity because H2 permeability was not sensibly affected by the crosslink reaction. POLYM. ENG. SCI., 54:1089–1099, 2014. © 2013 Society of Plastics Engineers

show abstract

Selectivity enhancement via photooxidative surface modification of polyimide air separation membranes

Cited by 31 publications

References 22 publications

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Maximizing the right stuff: The trade-off between membrane permeability and selectivity

Synthesis and gas transport properties of UV-cured low-viscosity fluorine-containing telechelic polyimide membranes

Characterization and gas permeation properties of UV-cured fluorine-containing telechelic polyimide membranes with a crosslinker

Contact Info

Product

Resources

About