Gas permeation properties of poly (1-trimethylsilyl-l-propynee) [PMSP] /poly (phenylacetylene) [PPA] blends are reported. As PPA content in these blends increases, gas permeability decreases, while gas separation factors and blend film density increase. For a pure PMSP film, the order of gas permeability coefficients is CO
2>CH
4≥H
2>O
2>N
2. However, for PMSP/PPA blend films, the permeability of CH
4 is lower than that of H
2. As a result, the ranking of gas permeabilities in PMSP/PPA blend films becomes CO
2>H
2>CH
4>O
2>N
2. Furthermore, the reduction in the ratio of blend permeability to PMSP permeability is greater for a larger penetrant than for a smaller penetrant. This reduction in blend-to-PMSP permeability ratio is smaller for PMSP/PPP blends than for the previously reported PMSP/ poly (1-phenyl-1-propyne) [PPP] blends at the same PPA and PPP contents.
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