We report a high performance CO₂ capture membrane based on the copolymerization and self-cross-linking of poly(glycidyl methacrylate-g-poly(propylene glycol))-co-poly(oxyethylene methacrylate) (PGP–POEM) comb copolymer. The epoxide–amine reaction is responsible for the self-cross-linking reaction, which takes place under mild conditions without any additional cross-linkers or catalysts. The effects of self-cross-linking on the membrane properties are investigated by comparing the copolymers with those containing a low PPG grafting density (l-PGP–POEM). Furthermore, the gas separation performance of the membranes is systematically investigated as a function of POEM content in the comb copolymer. Both the permeance and selectivity of the PGP–POEM membranes are enhanced simultaneously with increase in the POEM content up to 51.2 wt % (PGP–POEM13), at which the best performance was achieved among the membranes. The high performance results from the reduced diffusion of N₂ due to the self-cross-linked structure as well as the increased CO₂ solubility due to the high content of ether oxygen groups in the comb copolymer. By optimizing the membrane thickness, the performance is further improved up to a CO₂ permeance of 500 GPU (1 GPU = 10^–6 cm³ (STP)/(s cm² cmHg)) and CO₂/N₂ selectivity of 22.4, which is close to the commercialization target area of CO₂ capture membranes. This work suggests a simple and economical cross-linking method to fabricate the membranes with excellent gas separation performance.

中文翻译：

---

高性能自交联PGP–POEM梳状共聚物膜，用于CO ₂捕集

我们报告一个高性能CO ₂基于所述共聚和自交联的聚（甲基丙烯酸缩水甘油酯捕获膜克-聚（丙二醇）） -共-聚（氧乙烯甲基丙烯酸酯）（PGP-POEM）梳形共聚物。环氧-胺反应负责自交联反应，该反应在温和条件下进行，无需任何其他交联剂或催化剂。的自交联在膜上性能的影响是由共聚物与含有低PPG接枝密度（比较研究升-PGP-POEM）。此外，系统地研究了膜的气体分离性能与梳型共聚物中POEM含量的关系。随着POEM含量增加到51.2 wt％（PGP-POEM13），PGP-POEM膜的渗透性和选择性都得到了提高，在这些膜中达到了最佳性能。高性能归因于由于自交联结构而导致的N ₂扩散减少，以及由于梳状共聚物中醚氧基团的含量较高而导致的CO ₂溶解度增加。通过优化膜厚度，可进一步提高性能，直至CO ₂透过率达到500 GPU（1 GPU = 10 ^–6 cm ³（STP）/（s cm ² cmHg））和22.4的CO ₂ / N ₂选择性，接近于CO ₂捕获膜的商业化目标区域。这项工作提出了一种简单且经济的交联方法来制造具有出色气体分离性能的膜。