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rdac:C10001 bibo:Article

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Factors Controlling Successful Formation of Mixed-Matrix GasSeparation Materials

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n2:mahajanrajiv n2:koroswilliamj

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Prior work has suggested simple guidelines for matching transport characteristics of materialsto form high-performance mixed-matrix materials for gas separation. Such materials comprisea dispersion of molecular sieving particles in a properly selected matrix polymer phase. Recentwork has shown that these simple criteria are necessary but not sufficient to achieve the desiredproperties. The analysis presented here shows the need to optimize the transport properties ofthe interfacial region, i.e., the region between the bulk polymer and dispersed sieve phases.Guided by the need to optimize both the transport properties of the interfacial region and thematrix material selection criteria noted above, a new paradigm is recommended for matrix phaseselection. The practicality of the paradigm is validated by the formation of mixed-matrixmembranes with an appropriate polymer and sieve. These materials lead to the attractivepredicted performances at low loading. For success at higher loading a zeolite “priming” protocolbased on polymer-solvent sieve interactions is shown to be necessary. This modified protocolleads to success at intermediate and high dispersed-phase loading.

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