One‐pot transformation of monomer mixtures into block copolymers remains a key challenge. Herein, a metal‐free route to prepare block copolymers from monomer mixtures by a hydroxyl functionalized ionic liquid of 3‐(2‐hydroxyl‐ethyl)‐1‐methylimidazolium bromide (HEMIMB) is described. HEMIMB can bridge two catalytic cycles including ring‐opening alternating copolymerization (ROAC) of phthalic anhydride (PA) with epoxides and ring‐opening polymerization (ROP) of L‐lactide (LA), and enable a selective copolymerization from PA, LA, and epoxides. The selective copolymerization depends on the presence of PA in mixed feedstocks, exhibits the first ROAC of PA with epoxides and then ROP of LA to the formation of block polyesters in one‐pot strategy. This work is beneficial to the development of metal‐free catalysts for sequence‐controlled polymerization that enable block architectures from mixtures of monomers.

中文翻译：

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一种利用羟基官能离子液体从单体混合物中合成嵌段共聚酯的单罐策略

将单体混合物单锅转化为嵌段共聚物仍然是关键挑战。本文描述了通过3-（2-羟基-乙基）-1-甲基咪唑鎓溴化物（HEMIMB）的羟基官能化离子液体从单体混合物中制备嵌段共聚物的无金属方法。HEMIMB可以桥接两个催化循环，包括邻苯二甲酸酐（PA）与环氧化物的开环交替共聚（ROAC）和L-丙交酯（LA）的开环聚合（ROP），并使PA，LA和环氧化物。选择性共聚取决于混合原料中PA的存在，在单锅法中首先显示PA与环氧化物的ROAC，然后显示LA的ROP形成嵌段聚酯。