Conjugate acid-base bi-functional PILs (CAB-PILs) with carboxylate and carboxyl branches were synthesized and used as catalysts for the cycloaddition reaction of glycidol with CO₂. Two functional ionic monomers, 3-(carboxymethyl)-1-vinyl-1H-imidazol-3-ium chloride (CEImCl) and 2-(1-vinyl-1H-imidazol-3-ium-3-yl) acetate (CCIm), were introduced into the CAB-PILs skeleton. In this case, we proved the excellent characteristics of the catalyst containing both Lewis base and Bronsted acid sites for converting CO₂ to cyclic carbonate under mild conditions. The catalyst showed good reusability and remained excellent activity after five reaction cycles. Combined with XPS, FTIR and DFT calculations, it is proved that the CCIm ionic monomer not only play the role of CO₂ absorption center, but also has synergistic effect with CEImCl in CAB-PILs to promote cycloaddition reaction.

合成了具有羧酸根和羧基支链的共轭酸碱双功能 PIL (CAB-PIL)，并将其用作缩水甘油与 CO ₂的环加成反应的催化剂。两种功能性离子单体，3-(carboxymethyl)-1-vinyl-1H-imidazol-3-ium chloride (CEImCl) 和 2-(1-vinyl-1H-imidazol-3-ium-3-yl) acetate (CCIm) , 被引入 CAB-PILs 骨架。_{在这种情况下，我们证明了同时含有路易斯碱和布朗斯台德酸位点的催化剂在温和条件下将CO 2}转化为环状碳酸酯的优异特性。该催化剂表现出良好的可重复使用性，并在五个反应循环后仍保持优异的活性。结合XPS、FTIR和DFT计算证明CCIm离子单体不仅起到了CO _2的作用吸收中心，还与 CAB-PILs 中的 CEImCl 具有协同作用，促进环加成反应。