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The resulting ionomers with high IEC showed low swelling.
Low swelling in acidic media was related to proton calcium ion exchange forming insoluble acid gels.
Moreover, sPBI membranes exhibit appropriate water uptake, low swelling, and excellent mechanical properties.
It is a highly vulcanized rubber and has low swelling in a given liquid medium.
However, photografted layers usually have very low swelling ratios, swelling and stimuli-response rates.
The membranes exhibited a low swelling degree and methanol crossover level.
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Compared with other inhibitors, the addition of PEI resulted in the lowest swelling height in drilling fluid.
Specially, the composite membrane contained 2 wt% SGO show the lowest swelling ratio at high temperature (just 13.77% at 80 °C) and the highest proton conductivity of 0.183 S·cm−1 at 80 °C.
The lowest swelling, with a MSD value of 464% ± 6, was noticed for G-A, while the control PAA had a MSD value of 632% ± 4. The swelling is directly determined by the crosslinking density of each network.
(51) The gels containing the lowest molecular weight PEG (10 kDa, ρ x = 0.023 mol/L) resulted in the highest moduli (6200 ± 280 Pa) and lowest swelling (6.6 ± 0.7), whereas those with the highest molecular weight PEG (20 kDa, ρ x = 0.0018 mol/L) gave rise to the lowest observed moduli (2500 ± 220 Pa) and highest swelling (17.9 ± 0.9).
Polyphosphazenes are considered to be more useful as proton-conducting membranes than Nafion due to their low methanol permeability, low water swelling ratios, satisfactory mechanical properties, and conductivities comparable to those of Nafion.
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