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Fixing carbon dioxide (CO 2 ) into polymeric materials is a subject of enduring interest but limited to very few efficient polymerizations. In this work, a facile Pd(OAc) 2 /LiO t Bucatalyzed one-pot, three-component polymerization of CO 2 , bis(propargylic alcohol)s, and aryl dihalides under atmospheric pressure is developed. Linear and hyperbranched multifunctional five-membered cyclic carbonate (5CC)-based polymers with welldefined structures, high weight-average molecular weights (M w up to 42500), and versatile properties such as aggregation-induced emission as well as chiral and porous properties are successfully produced in excellent yields (up to 96%). The reaction mechanism was well investigated via the density functional theory calculation and in situ Fourier transform infrared spectroscopy, both indicating that there is synergistic reaction effect among CO 2 , bis(propargylic alcohol)s, and aryl dihalides. The polymers could be postfunctionalized by amines via catalyst-free regioselective ring-opening reaction with 100% grafting ratio. Thus, this work not only develops a new way to directly fix CO 2 into polymeric materials but also provides the 5CC-based polymers with versatile properties, showing great potentials in diverse areas.

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Hyperbranched polymers constructed from CO2 possess unique architectures and properties; however, they are difficult to prepare. In this work, CO2‐based, hyperbranched poly(alkynoate)s (hb‐PAs) with high molecular weights and degrees of branching are facilely prepared under atmospheric pressure in only 3 h. Because hb‐PAs possess two types of ethynyl groups with different reactivities, they can undergo site‐selective, three‐step functionalizations with nearly 100% conversion in each step. Taking advantage of this unique feature, functional hb‐PAs with versatile properties are constructed that could be selectively tailored to contain hydrophilic oligo(ethylene glycol) chains in their branched chains, on their periphery, or both via tandem polymerizations. Hyperbranched polyprodrug amphiphiles with high drug loading content (44.3 wt%) are also generated, along with an artificial light‐harvesting system with high energy transfer efficiency (up to 92%) and white‐light‐emitting polymers. This work not only provides an efficient pathway to convert CO2 into hyperbranched polymers, but also offers an effective platform for site‐selective multistep functionalizations toward functional polymeric materials.