One-Step and Metal-Free Synthesis of Triblock Quaterpolymers by Concurrent and Switchable Polymerization,ACS Macro Letters

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One-Step and Metal-Free Synthesis of Triblock Quaterpolymers by Concurrent and Switchable Polymerization
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-01-28 , DOI: 10.1021/acsmacrolett.9b00895
Shuaishuai Zhu ₁ , Yajun Zhao ₁ , Mingli Ni ₁ , Jing Xu ₂ , Xingping Zhou ₁ , Yonggui Liao ₁ , Yong Wang ₁ , Xiaolin Xie ₁

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A one-step and metal-free route to triblock quaterpolymers from mixtures of vinyl monomers, epoxides, anhydrides, and racemic lactide (rac-LA) has been described, which bridges three polymerization cycles involving ring-opening copolymerization (ROCOP) of epoxides/anhydrides, ring-opening polymerization (ROP) of rac-LA, and RAFT polymerization of vinyl monomers. Taking advantage of the switchable polymerization between ROCOP and ROP, concurrent chain propagation of ROCOP/RAFT and ROP/RAFT sequentially occurs by using a trithiocarbonate compound with carboxylic group (TTC–COOH) as a versatile chain transfer agent. The multiple-chain transfer effect enables independent and precise control over the molecular weights of the three blocks and ensures narrow distribution of the resultant triblock quaterpolymers (Đ < 1.20). This work demonstrates the possibility to acquire block copolymers with high degree of structural complexities in a single efficient process by combining different block polymerization strategies.

中文翻译：

三嵌段四元共聚物的同步和可切换聚合的一步无金属合成

已经描述了一种从乙烯基单体、环氧化物、酸酐和外消旋丙交酯 ( rac -LA)的混合物中制备三嵌段四元共聚物的一步且无金属的路线，该路线桥接了涉及环氧化物的开环共聚 (ROCOP) 的三个聚合循环/酸酐， rac的开环聚合（ROP）-LA 和乙烯基单体的 RAFT 聚合。利用 ROCOP 和 ROP 之间的可切换聚合，ROCOP/RAFT 和 ROP/RAFT 的同时链增长通过使用具有羧基的三硫代碳酸酯化合物 (TTC-COOH) 作为通用链转移剂依次发生。多链转移效应能够独立且精确地控制三个嵌段的分子量，并确保所得三嵌段四元共聚物的窄分布 ( Đ < 1.20)。这项工作证明了通过结合不同的嵌段聚合策略，在单一有效过程中获得具有高度结构复杂性的嵌段共聚物的可能性。

更新日期：2020-01-29

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