DMA was carried out with an ITK DVA-225 dynamic viscoelastic analyzer to evaluate the temperature (heating rate of 1°C min−1 from r.t. to 100°C at 60% RH or from r.t. to 120°C at 20% RH) or humidity (humidification rate of 1% RH min−1 from 0 to 90% RH at 80°C) dependence of the storage moduli (E′), loss moduli (E″), and tan δ (= E″/E′) of the membranes.
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