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Dynamic mechanical analysis (DMA)
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DMA (Q800, TA Instrument, DE, USA) was employed to measure the glass-transition (Tg) temperature, SM, and loss modulus (LM) of AEPs. Specifically, all membrane samples were cut into a 0.9 × 2 cm shape and were fixed with tension clamps in the DMA system. DMA testing was performed with a 1 Hz single-frequency strain mode, a preload force of 0.01 N and a force track of 125% under a nitrogen atmosphere. The target temperature was set to 450 °C along with a 10 °C/min ramping rate.
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