Two novel gas separation membranes (Phenyl(Ph)-poly(ether ether ketone)s (PEEKs) and PEEKs) based on PEEKs with a high fractional free volume were designed and synthesized. The structure and thermodynamic stability of the membranes were investigated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The two membranes, which were determined to be high-molecular weight polymers by gel permeation chromatography, showed good solubility in a weakly polar solvent. The gas transport properties of the Ph-PEEK membranes were investigated for different gases (CO2, O2, CH4, and N2) at 25°C and 1 atm. The Ph-PEEK-3 membrane with the largest free volume had the largest gas permeability coefficient and maintained good selectivity. The effect of operating temperature on the gas permeation of the Ph-PEEK-3 membrane was also investigated, and the maximum permeability of the four single gases was reached at 55°C and 1 atm.

中文翻译：

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新型含芴基聚醚醚酮的合成及输气性能

设计并合成了两种基于具有高自由体积分数的 PEEK 的新型气体分离膜（苯基（Ph）-聚（醚醚酮）（PEEK）和 PEEK）。使用傅里叶变换红外光谱、质子核磁共振光谱和热重分析研究了膜的结构和热力学稳定性。通过凝胶渗透色谱法确定这两种膜是高分子量聚合物，在弱极性溶剂中显示出良好的溶解性。研究了 Ph-PEEK 膜在 25°C 和 1 个大气压下对不同气体（CO2、O2、CH4 和 N2）的气体传输特性。自由体积最大的Ph-PEEK-3膜具有最大的气体渗透系数并保持良好的选择性。