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Membranes 2012, 2(4), 727-763; doi:10.3390/membranes2040727
Review

Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation

1
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, 3,* , 2,4,*  and 1,*
Received: 31 July 2012; in revised form: 24 September 2012 / Accepted: 25 September 2012 / Published: 22 October 2012
(This article belongs to the Special Issue Membrane Processes and Energy)
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Abstract: Pervaporation and gas separation performances of polymer membranes can be improved by crosslinking or addition of metal-organic frameworks (MOFs). Crosslinked copolyimide membranes show higher plasticization resistance and no significant loss in selectivity compared to non-crosslinked membranes when exposed to mixtures of CO2/CH4 or toluene/cyclohexane. Covalently crosslinked membranes reveal better separation performances than ionically crosslinked systems. Covalent interlacing with 3-hydroxypropyldimethylmaleimide as photocrosslinker can be investigated in situ in solution as well as in films, using transient UV/Vis and FTIR spectroscopy. The photocrosslinking yield can be determined from the FTIR-spectra. It is restricted by the stiffness of the copolyimide backbone, which inhibits the photoreaction due to spatial separation of the crosslinker side chains. Mixed-matrix membranes (MMMs) with MOFs as additives (fillers) have increased permeabilities and often also selectivities compared to the pure polymer. Incorporation of MOFs into polysulfone and Matrimid® polymers for MMMs gives defect-free membranes with performances similar to the best polymer membranes for gas mixtures, such as O2/N2 H2/CH4, CO2/CH4, H2/CO2, CH4/N2 and CO2/N2 (preferentially permeating gas is named first). The MOF porosity, its particle size and content in the MMM are factors to influence the permeability and the separation performance of the membranes.
Keywords: pervaporation; separation; photocrosslinking; membranes; permeability; permselectivity; mixed-matrix membranes; mechanism; crosslinking degree; photochemistry; metal-organic frameworks; MOFs; porosity pervaporation; separation; photocrosslinking; membranes; permeability; permselectivity; mixed-matrix membranes; mechanism; crosslinking degree; photochemistry; metal-organic frameworks; MOFs; porosity
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Hunger, K.; Schmeling, N.; Jeazet, H.B.T.; Janiak, C.; Staudt, C.; Kleinermanns, K. Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation. Membranes 2012, 2, 727-763.

AMA Style

Hunger K, Schmeling N, Jeazet HBT, Janiak C, Staudt C, Kleinermanns K. Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation. Membranes. 2012; 2(4):727-763.

Chicago/Turabian Style

Hunger, Katharina; Schmeling, Nadine; Jeazet, Harold B. Tanh; Janiak, Christoph; Staudt, Claudia; Kleinermanns, Karl. 2012. "Investigation of Cross-Linked and Additive Containing Polymer Materials for Membranes with Improved Performance in Pervaporation and Gas Separation." Membranes 2, no. 4: 727-763.



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