Photostationary State in Dynamic Covalent Networks,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.)

Photostationary State in Dynamic Covalent Networks
ACS Macro Letters ( IF 5.1 ) Pub Date : 2022-03-31 , DOI: 10.1021/acsmacrolett.2c00097
Lewis C Chambers ₁ , Christopher Barner-Kowollik _{1,

2} , Leonie Barner ₁ , Lukas Michalek ₁ , Hendrik Frisch ₁

Affiliation

We explore a cross-linked polymer network based on a visible light photodynamic [2 + 2] cycloaddition driven by styrylpyrene chemistry. Based on a polymer backbone with pendent styrylpyrene units, the network can be formed by using λ = 450 nm irradiation. Upon irradiation with λ = 340 nm, a photostationary state is generated within the network with ∼17% of the styrylpyrene units open compared to close to 2% in the visible light cured state. The limited fraction of open [2 + 2] couples is caused by their proximity and is in sharp contrast to solution experiments on the photoreactive moiety. Thus, the polymer network retains its mechanical properties even at the photostationary point. We hypothesize that the application of an additional stimulus could serve as a second gate for inducing network disintegration by spacing the [2 + 2] units during ultraviolet irradiation.

中文翻译：

动态共价网络中的光静止状态

我们探索了一种基于由苯乙烯基芘化学驱动的可见光光动力学 [2 + 2] 环加成的交联聚合物网络。基于具有悬垂苯乙烯基芘单元的聚合物骨架，可以通过使用 λ = 450 nm 照射形成网络。在 λ = 340 nm 的照射下，网络内产生光静止状态，其中约 17% 的苯乙烯基芘单元打开，而在可见光固化状态下接近 2%。开放 [2 + 2] 对的有限部分是由它们的接近引起的，并且与光反应部分的溶液实验形成鲜明对比。因此，聚合物网络即使在光静止点也能保持其机械性能。

更新日期：2022-03-31

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