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Fig. 12 Methanol permeability of membrane SA/SGO6 vs. temperature.

Two tank liquid permeability cells with 20 v/v% methanol were used to determine the methanol permeability of the membrane.

The methanol permeability of the SA/SGO6 bio membrane at four different temperature conditions is shown in Fig. 12.

Additionally, the methanol permeability of Br-20-SPAEK-40 Br-20-SPAEK-40 Br-20-SPAEK-40 Br-20-SPAEK-40fisn 117.

Moreover, the incorporation of PMCs reduces the activation energy for proton conduction and the methanol permeability of the membranes.

The methanol permeability of directional conducting membrane is very low, which is about twice smaller than that of Nafion117.

The methanol permeability values of the membranes were in the range of 7.0 × 10−7 9.4 × 10−8 cm2/s at 30 °C, which is several times lower than that of Nafion 117.

The methanol permeability values of these SPIs were in the range of 0.99 2.36 × 10−7 cm2/s, which are much lower than that of Nafion 117 (2 × 10−6 cm2/s).

The methanol permeability values of the obtained membranes are in the range of 0.63 9.60 × 10−7 cm2 s−1, which are much lower than the value of Nafion 117 (2.94 × 10−6 cm2 s−10−6

In particular, mechanical strength, proton conductivity and methanol permeability prevention of the composite membranes were significantly enhanced upon incorporation of the SCNFs as fillers.

The effects of different degrees of sulfonation on the water uptake, proton conductivity, and methanol permeability coefficient of the membranes were studied.