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2 article(s) from Staudt, Claudia

Synthesis and characterization of a novel carboxyl group containing (co)polyimide with sulfur in the polymer backbone

Miroslav Mrsevic,
David Düsselberg and
Claudia Staudt

Beilstein J. Org. Chem. 2012, 8, 776–786, doi:10.3762/bjoc.8.88

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Graphical Abstract

Scheme 1: General synthesis scheme for the (co)polyimides investigated in this work.

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Figure 1: Aromatic section of the ¹H NMR spectra of 6FDA-4,4′-SDA/6FDA-DABA, m:n = 4:1.

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Figure 2: Aromatic section of the ¹H NMR spectra of 6FDA-3,3′-DDS/6FDA-DABA, m:n = 4:1.

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Figure 3: FTIR spectrum of 6FDA-4,4′-SDA/6FDA-DABA 4:1.

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Figure 4: FTIR spectrum of 6FDA-3,3′-DDS/6FDA-DABA 4:1.

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Figure 5: Glass-transition temperatures of the synthesized (co)polyimides, their respective homopolymers [24,26,27] and...

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Figure 6: Comparison of the relative moisture uptake after one day between 6FDA-3,3′-DDS/6FDA-DABA 4:1 and 6F...

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Figure 7: Transmittance UV–vis spectra of 6FDA-4,4′-SDA/6FDA-DABA 4:1 and 6FDA-3,3′-DDS/6FDA-DABA 4:1.

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Figure 8: Transmittance UV–vis spectra of 6FDA-4,4′-SDA/6FDA-DABA (co)polyimides.

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Full Research Paper

Published 25 May 2012

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Functionalized copolyimide membranes for the separation of gaseous and liquid mixtures

Nadine Schmeling,
Roman Konietzny,
Daniel Sieffert,
Patrick Rölling and
Claudia Staudt

Beilstein J. Org. Chem. 2010, 6, 789–800, doi:10.3762/bjoc.6.86

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Figure 1: Membrane based separation process.

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Figure 2: Chemical structure of the 6FDA (= 4,4′-hexafluoroisopropylidene diphthalic anhydride).

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Figure 3: Plasticization phenomenon and resulting effects on separation characteristics.

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Figure 4: Synthesis of cross-linkable copolyimide structures.

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Figure 5: Investigated cross-linking variations (non cross-linked, covalently and ionically cross-linked).

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Figure 6: Hybrid process for the separation of propylene/propane.

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Figure 7: Total permeability (left) and selectivity (right) for the 6FDA-4MPD (●) and the 6FDA-4MPD/6FDA-DABA...

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Figure 8: Conventional separation process for reformates containing extraction and stripping unit.

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Figure 9: Hybrid process for the separation of aromatics/aliphatics.

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Figure 10: Pervaporation results for the 6FDA-6FpDA/6FDA-4MPD/6FDA-DABA 3:1:1 copolyimide cross-linked with et...

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Figure 11: Pervaporation results for 6FDA-4MPD/6FDA-DABA 4:1 copolyimide (non cross-linked) conditioned in pur...

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Figure 12: Pervaporation results for conditioned 6FDA-4MPD/6FDA-DABA 4:1 copolyimide membranes, 100% cross-lin...

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Figure 13: Hybrid process for the removal of CO₂ in tertiary oil production processes.

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Figure 14: Pure CO₂ permeabilities at 35 °C for the 6FDA-4MPD (■), the 6FDA-4MPD/6FDA-DABA 4:1 copolyimide ion...

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Figure 15: CO₂/CH₄ separation characteristics for the 6FDA-4MPD/6FDA-DABA 4:1 copolyimide ionically cross-link...

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Full Research Paper

Published 12 Aug 2010

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