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membranes are significant because of the large number and
importance of molecules within this range of molecular weights
and the need to separate them in the chemical industry. For
instance, many reactions require metal catalysts with ligands
such as phosphines. It is important that the final product be clean
of all but ppm levels of impurities of metal and phosphines so
several purification steps are often required to clean the product.
PDCPD membranes offer a new solution to cleaning the prod-
ucts and recycling the catalysts.
The surprising aspect of PDCPD membranes is not that they
separate molecules based on cross-sectional area because cross-
sectional area is well known as a critical parameter that affects
flux. Rather, it was surprising that these membranes were the first
to have a critical importance of cross-sectional area for the flux of
molecules within this range of molecular weights. In addition, the
difference in permeation was very large; molecules that did not
permeate the membranes were undetected in the solvent down-
stream of the membrane and possessed values for flux that were
104 to 105 times slower than molecules that permeated the
membranes. The origins of the selectivity of these membranes lies
in the size and distribution of pore sizes that result when the
polymer is cross-linked, and these materials properties will be
studied in more detail in future work. An understanding of what
makes PDCPD so unique may allow the design of more
membranes with similar separations but faster flux.
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Acknowledgements
We thank the NSF (CHE-0848162) for funding this work.
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