Hyperbranched polymers are an important class of soft nanomaterial, but the synthesis of hyperbranched polymers with well-defined dendritic structure from readily available monomers remains a challenge in polymer chemistry. We herein report a sequential polycondensation method for the one-pot synthesis of hyperbranched polymers with tunable structure and high degree of branching from commercial available monomers. Specifically, in the polycondensation process of equimolar difunctional haloalkane (A₂-type monomers) and trifunctional dihydroxybenzoic acid (CB₂-type monomers) using K₂CO₃ as the base, the aliphatic nucleophilic substitution reactivity sequence of the functional groups derived from CB₂ monomers is C > second B > first B ≫ original B, thereby producing hyperbranched poly(ester ether)s with high degree of branching (DB > 0.6). Moreover, the surface functionality of the hyperbranched poly(ester ether)s could be facilely tailored by just introducing A-type monofunctional reagents into the one-pot A₂ + CB₂ polymerization system.

中文翻译：

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顺序缩聚法轻松合成超支化聚合物

超支化聚合物是一类重要的软纳米材料，但从容易获得的单体合成具有明确树枝状结构的超支化聚合物仍然是聚合物化学的一个挑战。我们在此报告了一种顺序缩聚方法，用于一锅法合成具有可调结构和高支化度的商用单体的超支化聚合物。具体地，在以K ₂ CO ₃为碱的等摩尔双官能卤代烷（A ₂型单体）和三官能二羟基苯甲酸（CB ₂型单体）的缩聚过程中，CB衍生的官能团的脂肪族亲核取代反应序列₂单体是 C > 第二个 B > 第一个 B ≫ 原始 B，从而产生具有高支化度（DB > 0.6）的超支化聚（酯醚）。此外，只需将A型单官能试剂引入一锅A ₂ + CB ₂聚合体系即可轻松定制超支化聚（酯醚）的表面官能度。