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Molecular mechanics (MM) and the gradually reduced size (GRS) techniques were used to construct the crystalline poly-p-xylylene (PPX) films, including PPX N, PPX C and PPX D. The corresponding chain-end area of crystalline PPX films provides enough free volumes for adsorbing and transferring gas molecules. Then, the permeable properties of gases were calculated using Grand Canonical Monte Carlo (GCMC),...
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