Hydrogen bond donors (e.g., OH, COOH) functionalized porous ionic polymers, featuring high specific surface areas and bi/multi-functional active sites, are promising candidates for metal- and co-catalyst free catalytic conversion of CO₂. Herein, a facile method for the preparation of hydrogen bond donors (HBDs) functionalized porous ionic polymers (PIPs) was developed via the strategy of integrating free-radical polymerization and HBDs functionalization reactions into a single operation. Through this one-pot method, bifunctional PIPs with dual active sites (HBDs and Br⁻), high surface areas and large pore volumes were easily synthesized. Among the designed catalysts, the catalyst bearing carboxyl groups (PQPBrCOOH) presented better catalytic performance in the cycloaddition of CO₂ into cyclic carbonates than that with hydroxyl groups (PQPBrOH); meanwhile, the HBDs-free catalyst (PQPBr) exhibited the lowest catalytic activity. Also, under atmospheric CO₂ pressure and co-catalyst free conditions, PQPBrCOOH showed high catalytic activity, excellent reusability and broad substrate tolerance. Results of the catalytic tests and density functional theory (DFT) calculations suggested that the synergism between Br⁻ and HBDs was critical for the activation of epoxides, and therefore enhanced the catalytic activities. Thus, this work provided not only an active, stable and heterogeneous catalyst for the conversion of CO₂, but, more importantly, a facile and one-step strategy for constructing bifunctional porous ionic polymers.

氢键供体（例如，OH、COOH）功能化的多孔离子聚合物具有高比表面积和双/多功能活性位点，是无金属和助催化剂的 CO ₂催化转化的有希望的候选者。在此，通过将自由基聚合和 HBD 功能化反应整合到单一操作中的策略，开发了一种制备氢键供体 (HBD) 功能化多孔离子聚合物 (PIP) 的简便方法。通过这种一锅法，具有双活性位点（HBDs 和 Br ^-)，容易合成高表面积和大孔体积。在设计的催化剂中，含羧基的催化剂(PQPBrCOOH)在CO ₂环加成成环状碳酸酯中的催化性能优于含羟基的催化剂(PQPBrOH)；同时，不含HBDs的催化剂（PQPBr）表现出最低的催化活性。此外，在大气 CO ₂压力和无助催化剂条件下，PQPBrCOOH 表现出高催化活性、优异的可重复使用性和广泛的底物耐受性。催化测试和密度泛函理论 (DFT) 计算的结果表明 Br ^-HBDs 对环氧化物的活化至关重要，因此提高了催化活性。因此，这项工作不仅为CO ₂的转化提供了一种活性、稳定和非均相的催化剂，而且更重要的是，为构建双功能多孔离子聚合物提供了一种简便的一步策略。