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Simultaneously, the acquired composite membranes exhibited exemplary thermal stability and dimensional stability. The as-prepared SPEN/UiO-66-NH2-x cross-linked membranes exhibited higher proton conductivity than recast SPENs, which are often attributed to the construction of ionic groups and well-connected ionic nanochannels across the screen between UiO-66-NH2-x and SPEN matrix via molecular interactions. Meanwhile, the methanol permeability associated with the SPE