The　catalytic　conversion　of　CO2　into　valuable　cyclic　carbonates　has　emerged　as　a　sustainable　and　effective　strategy　to　mitigate　global　warming.　However,　the　activation　of　CO2　remains　challenging　due　to　its　high　intrinsic　thermodynamic　stability　and　kinetic　inertness.　To　address　this,　an　imidazolium-　and　triazine-based　ionic　polymer　[(HO)3-ImtTbIP]　was　synthesized　via　the　quaternization　reaction　of　1,2,4,5-tetrakis　(bromomethyl)benzene　(Tb)　with　2,4,6-tris(4-(1H-imidazole-1-yl)phenyl)-1,3,5-triazine　(Imt)　and　2-(hydroxymethyl)-2-(1H-imidazole-1-yl)propane-1,3-diol　[(HO)3].　The　2-(hydroxymethyl)-2-(1H-imidazole-1-yl)propane-1,3-diol　moieties　in　the　polymer　backbone　act　as　strong　hydrogen　bond　donors,　facilitating　the　weakening　of　the　C–O　bond　in　epoxides,　while　the　charge-balanced　bromide　anions　function　as　nucleophiles,　attacking　the　activated　epoxides　and　enabling　ring-opening.　Simultaneously,　CO2　activated　through　the　triazinyl　and　imidazolium　groups　interact　with　oxyanion　intermediates　to　form　alkyl　carbonate　species.　The　(HO)3-ImtTbIP,　featuring　well-defined　task-specific　active　functional　groups　show　efficient　conversion　of　CO2　and　epoxides　to　cyclic　carbonates　under　mild　conditions　(100　°C,　1　bar　CO2).　This　pre-functionalized　polymer　exhibits　significant　potential　for　sustainable　CO2　utilization.　©　2025　Elsevier　Ltd