Switchable RAFT Polymerization Employing Photoresponsive HABI as a Mediator,Macromolecular Rapid Communications

当前位置： X-MOL 学术 › Macromol. Rapid Commun. › 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.)

Switchable RAFT Polymerization Employing Photoresponsive HABI as a Mediator
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2022-10-17 , DOI: 10.1002/marc.202200664
Yue Sun ₁ , Yuyan Weng ₁ , Gaojian Chen ₁ , Weidong Zhang _{1,

2}

Affiliation

Recently, considerable interest has been devoted to developing switchable reversible addition fragmentation chain transfer (RAFT) polymerizations via photoactivation methods. Herein, a photo-deactivation strategy is introduced to regulate RAFT polymerization using photoresponsive hexaarylbiimidozole (HABI) as a mediator, which leads to switchable RAFT polymerization by repeated ON/OFF experiments. In comparison with well-known PET-RAFT polymerization, photo-deactivation RAFT (PD-RAFT) polymerization can be temporally stopped with UV light ON, where photoresponsive HABI can reversibly quench propagating radicals, resulting in switchable RAFT polymerization. The proposed mechanism of PD-RAFT polymerization in the presence of HABI involving radical quenching is based on ESR, NMR, GPC, MALDI-TOF-MS, and kinetics studies.

中文翻译：

采用光响应 HABI 作为介质的可切换 RAFT 聚合

最近，相当大的兴趣致力于通过光活化方法开发可切换的可逆加成断裂链转移 (RAFT) 聚合。在此，引入了一种光失活策略来调节 RAFT 聚合，使用光响应性六芳基双咪唑 (HABI) 作为介质，通过重复的开/关实验导致可切换的 RAFT 聚合。与众所周知的 PET-RAFT 聚合相比，光失活 RAFT (PD-RAFT) 聚合可以在开启紫外线的情况下暂时停止，其中光响应性 HABI 可以可逆地淬灭传播自由基，从而导致可切换的 RAFT 聚合。在 HABI 存在下涉及自由基淬灭的 PD-RAFT 聚合的拟议机制基于 ESR、NMR、GPC、MALDI-TOF-MS 和动力学研究。

更新日期：2022-10-17

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