Photocontrolled RAFT Polymerization Catalyzed by Conjugated Polymers under Aerobic Aqueous Conditions,ACS Macro Letters

当前位置： X-MOL 学术 › ACS Macro Lett. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Photocontrolled RAFT Polymerization Catalyzed by Conjugated Polymers under Aerobic Aqueous Conditions
ACS Macro Letters ( IF 5.1 ) Pub Date : 2021-07-16 , DOI: 10.1021/acsmacrolett.1c00416
Huan Lu _{1,

2} , Yiming Huang _{1,

3} , Endong Zhang _{1,

3} , Yiming Liu _{1,

2} , Fengting Lv _{1,

3} , Libing Liu _{1,

3} , Yuguo Ma _{1,

2} , Shu Wang _{1,

3}

Affiliation

Photocontrolled polymerization offers a convenient way to direct the reaction progress and tailor the polymer structures. Nevertheless, conjugated polymers are yet to be utilized as the photocatalyst in associated reactions. Herein, we employed poly(boron dipyrromethene-alt-fluorene) (PBF), a conjugated polymer with better photostability than eosin Y, as the photocatalyst for photo-RAFT polymerizations of acrylic monomers, and the polymers were obtained with moderately narrow molecular weight distributions. The reaction progress was effectively controlled by switching irradiation conditions, and the block copolymers were prepared from chain extension of a macroinitiator. As electron spin resonance (ESR) and optical spectra results suggested, the reductive quenching of PBF* by ascorbate was the key step leading to the reduction of a chain transfer agent (CTA), whereas the hydroxyl radical derived from superoxide was considered as a byproduct of deoxygenation.

中文翻译：

好氧水条件下共轭聚合物催化的光控RAFT聚合

光控聚合提供了一种方便的方法来指导反应进程和调整聚合物结构。然而，共轭聚合物尚未用作相关反应中的光催化剂。在此，我们采用聚（硼二吡咯亚甲基）-芴）（PBF）是一种比曙红Y具有更好光稳定性的共轭聚合物，作为丙烯酸单体光RAFT聚合的光催化剂，得到的聚合物具有适度窄的分子量分布。通过切换辐照条件有效地控制了反应进程，并通过大分子引发剂的扩链制备了嵌段共聚物。电子自旋共振 (ESR) 和光谱结果表明，抗坏血酸对 PBF* 的还原猝灭是导致链转移剂 (CTA) 还原的关键步骤，而源自超氧化物的羟基自由基被认为是副产物的脱氧。

更新日期：2021-08-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11