By applying the NELF approach on both the homopolymer and copolymers, a clear trend emerged: as the PDD content increased, the effective k ij decreased, even more than that of R-32 due to the fact that R-125 showed a sharper response to changes in copolymer composition.
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Description of Gas Transport in Polymers: Integrated Thermodynamic and Transport Modeling of Refrigerant Gases in Polymeric Membranes.
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