In this paper, ethyl phthalyl ethyl glycolate (EPEG) was first introduced into Pebax to prepare Pebax/EPEG MMMs for CO₂ separation. The thermal properties and the gas permeation properties of the MMMs were investigated. The micro-nano structure of the MMMs and the interaction between Pebax and EPEG were studied with fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). The compatibility of Pebax and EPEG was characterized with FTIR-mapping and DSC. The location and distribution of liquid EPEG was studied with SEM and confirmed visually by cryo-SEM. The strength of hydrogen bonding interaction in the MMMs was characterized by Kwei equation with a parameter q. Pebax and EPEG were almost miscible in the MMMs at the molecular level when the EPEG content was not higher than 20 wt.%, and then micro-phase separation happened at higher EPEG content. The incorporation of EPEG not only enhanced the diffusion coefficients but also the solubility coefficients of the penetrants through the MMMs. The occurrence of micro-phase separation rendered a greater degree of permeability increase. For the MMMs with EPEG content of 60 wt.%, the CO₂ permeability was almost 400 Barrer companied with CO₂/N₂ selectivity of 30. The CO₂ permeability was three times that of the pristine Pebax, indicating the good CO₂/N₂ separation performance of Pebax/EPEG MMMs.

本文首先将邻苯二甲酰基乙基乙醇酸乙酯（EPEG）引入Pebax，以制备用于CO _2的Pebax / EPEG MMM。分离。研究了MMM的热学性质和气体渗透性质。利用傅里叶变换红外光谱（FTIR），差示扫描量热法（DSC）和热重分析（TGA）研究了MMM的微纳米结构以及Pebax与EPEG之间的相互作用。Pebax和EPEG的相容性通过FTIR映射和DSC进行表征。用SEM研究了液体EPEG的位置和分布，并通过冷冻-SEM目测确认。MMM中氢键相互作用的强度用参数为q的Kwei方程表征。当EPEG含量不高于20 wt。％时，在分子水平上Pebax和EPEG在MMM中几乎是可混溶的，然后在更高的EPEG含量下发生微相分离。EPEG的加入不仅增强了渗透剂通过MMM的扩散系数，而且还提高了渗透剂的溶解度系数。微相分离的出现使渗透率增加程度更大。对于EPEG含量为60 wt。％的MMM，CO₂渗透性几乎400巴雷旅游公司用CO ₂ / N ₂选择性30.的CO ₂渗透率为三倍于原始的Pebax，表明良好的CO ₂ / N ₂的Pebax / EPEG的MMM的分离性能。