We synthesized diverse but systematic sets of co-polyimides, containing symmetric and asymmetric polymer backbone structure, to explore effects of matrix rigidity and packing of precursor polyimides on final CMS properties. We also explored the interaction of pyrolysis conditions on final CMS properties. Permeation was tested using both pure gases (He, O2, N2, CO2, CH4,C2H4, C2H6, C3H6, C3H8) and mixed gases for both the polyimide precursor membranes as well as the resulting CMS membranes. We correlated separation performance of precursor polyimides and formation conditions with the CMS membranes’ gas separation performance. This research provides an improved fundamental framework to guide the systematic understanding and fabrication of CMS membranes for important energy intensive separations.
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