## 4 Results and Discussion
### Comparison with Previous Studies
\begin{table}
\begin{tabular}{c c c c c} \hline \hline
**Material** & \begin{tabular}{c} **H\({}_{2}\)O Permeability** \\ **(Barrer)** \\ \end{tabular} & \begin{tabular}{c} **N\({}_{2}\) Permeability** \\ **(H\({}_{2}\)O/N\({}_{2}\))** \\ \end{tabular} & \begin{tabular}{c} **Selectivity** \\ **(H\({}_{2}\)O/N\({}_{2}\))** \\ \end{tabular} & \
\begin{tabular}{c} **Base Condition** \\ \end{tabular} &
\begin{tabular}{c} **Ref.** \\ \end{tabular} \\ \hline Ethyl cellulose & 20,000 & 3.3 & 6061 & \\ Cellulose acetate (CA) & 60,000 & 2.5 & 24,000 & \\ Natural rubber & 2600 & 0.87 & 2999 & \\
1000\({}_{\text{PG2}}\)5\({}_{\text{PG2}}\)+44 & 85,500 & 2.11 & 40,500 & \\ Polyacrylonitrile & 300 & 0.00016 & 1,875,000 & \\ Polyamide \& 6 Nylon 6 & 275 & 0.025 & 11,000 & \\ Polycarbonate & 1400 & 0.3 & 4667 & Temperature: 30 \({}^{\circ}\)C \\ Polydimethylsiloxane & 40,000 & 279.72 & 143 & \\ Polyethylene & 2620 & 0.25 & 10,480 & Data from the reference \\ Polyethylene & 12 & 2 & 6 & literature were used and \\ Polyimide (Kapton) & 640 & 0.00012 & 5,333,333 & extrapolated to a vapor \\ Polyphenylenoicide & 4060 & 3.8 & 1068 & activity of 0 \\ Polypropylene & 68 & 0.3 & 227 & \\ Polystyrene & 970 & 2.5 & 388 & \\ Polysulfine & 2000 & 0.25 & 8000 & \\ Polyvinylalcohol & 19 & 0.00057 & 33,333 & \\ Polyvinylchloride & 275 & 0.02 & 12,500 & \\ Sulfonated polyetheretherket (SPEEK) & 61,000 & 0.006 & 10,166,667 & \\ Sulfonated polyethersulfone (SPES) & 15,000 & 0.07 & 214,286 & \\ \hline Sulfonated polyetherketon (SPEEK) & 490,000 & 0.14 & 3,500,000 & \begin{tabular}{c} Temperature: 30 \({}^{\circ}\)C, RH: 93\%, \\ Feed side pressure: 2.5 bar, \\ Mixed-gas measurement \\ \end{tabular} & [20] \\ PEBAX\({}^{\copyright@}\) 1074 (polyeth block amide + poly) & 200,000 & 1.92 & 104,166.67 & \\ \hline PEBAX\({}^{\copyright@}\) 1074 (polyeth block amide + poly) & 160,000 & 0.8 & 200,000 & Single gas ratio (Ideal) \\ Stabilized liquid polyethylene glycol & 15,000 & 7.5 & 2000 & \
\begin{tabular}{c} Temperature: 43.4 \({}^{\circ}\)C, H\({}_{2}\)O \\ mole fraction: 0.02, \\ Mixed-gas measurement \\ \end{tabular} & [21] \\ NaA zeolite/Ni sheet & 60,900 & 342.13 & 178 & \\ \hline Graphene oxide & 182,000 & 18.2 & 10,000 &
\begin{tabular}{c} Temperature: 43.4 \({}^{\circ}\)C, H\({}_{2}\)O \\ mole fraction: 0.02, \\ Mixed-gas measurement \\ \end{tabular} & [22] \\ \hline Stabilized liquid Triethylene glycol & 3360 & 1.68 & 2000 & - \\ \hline (emim) (Tf\({}_{\text{N}}\)) & 283,000 & 73.64 & 3843 & \\ (N(4)111) (Tf\({}_{\text{N}}\)) & 133,000 & 40.43 & 3290 & Single gas ratio (Ideal) \\ (emim) (BF\({}_{\text{i}}\)) & 354,000 & 21.72 & 16,300 & \\ \hline PDMS & 15,000 & 468.75 & 32 & \\ PTMSMMA & 2400 & 10 & 240 & Temperature: 35 \({}^{\circ}\)C \\ PTMSP & 9200 & 7666.67 & 1.2 & Nitrogen permeability data at \\ 6 FDA-mPD & 600 & 0.55 & 1100 & 1 atm, Constant-volume \\ 6 FDA-MPD & 1300 & 2 & 650 & variable-pressure, \\ 6 FDA-MTD & 12,000 & 16.9 & 710 & Infinite-dilution data \\ \hline \hline \end{tabular}
\end{table} 
Table 7: H\({}_{2}\)O and N\({}_{2}\) permeability and selectivity data from previous studies of various membrane materials. studies listed in Table 7 are shown in Figure 7 to summarize the performance of different water vapor permeation membranes. In Figure 7, the data in the red boxes are a result of using the same membrane, but different indicator values are given depending on the analysis and calculation methods. In the paper, to compare SPEEK and PEBAX membranes [20], it is explained that mixing and measuring schemes affect the membrane performance, hence, other results may be different. Therefore, it is also difficult to select a membrane material solely based on its performance data, without considering the measurement conditions and analytical methods. Except for the cases of the test D and the cup method with the selectivity data unavailable, the remaining five results are shown in Figure 7 and compared with data from previous studies.