Comparing photoswitching of acrylate or methacrylate polymers conjugated with donor–acceptor Stenhouse adducts,Polymer Chemistry

当前位置： X-MOL 学术 › Polym. Chem. › 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.)

Comparing photoswitching of acrylate or methacrylate polymers conjugated with donor–acceptor Stenhouse adducts
Polymer Chemistry ( IF 4.1 ) Pub Date : 2019-11-05 , DOI: 10.1039/c9py01345h
Jeaniffer E. Yap _{1,

2,

3} , Neil Mallo _{1,

2,

3} , Donald S. Thomas _{1,

2,

3} , Jonathon E. Beves _{1,

2,

3} , Martina H. Stenzel _{1,

2,

3}

Affiliation

Polymers with donor–acceptor Stenhouse adduct (DASA) groups were synthesized using RAFT methods to evaluate the effect of polymer length (20 vs. 100 DP units) and backbone rigidity (acrylate and methacrylate blocks). A model DASA was not able to switch in water, however once the DASA is conjugated into a polymer, it shows a reversible switching in water. The backbone and chain length of the polymer have a significant effect on the switching ability of the DASA, where only the short methacrylate polymer (pMAEMA₂₉ DASA, sample 3A) shows a fast photoinduced isomerization, rapid thermal recovery and good fatigue resistance. A block copolymer was synthesized with methacrylate polymers containing DASA units by chain extension with a pPEGMEMA block (pPEGMEMA₂₀-b-pMAEMA₂₉, sample 4). The hydrophilic pPEGMEMA block stabilizes the colored isomer of the DASA in DMSO solution relative to both the homopolymer and the free model DASA. Relatively small changes in local environment caused by polymer length results in significant changes in the switching properties of the DASA units decorating the polymer chain, highlighting that detailed understanding of DASA behavior is recommended before applying these in more complex systems.

中文翻译：

比较与供体-受体Stenhouse加合物共轭的丙烯酸酯或甲基丙烯酸酯聚合物的光开关

使用RAFT方法合成了具有供体-受体Stenhouse加合物（DASA）基团的聚合物，以评估聚合物长度（20对100 DP单元）和骨架刚性（丙烯酸酯和甲基丙烯酸酯嵌段）的影响。DASA模型无法在水中转换，但是一旦DASA与聚合物共轭，它就会在水中显示出可逆转换。聚合物的主链和链长对DASA的转换能力有重要影响，其中只有短的甲基丙烯酸酯聚合物（pMAEMA ₂₉ DASA，样品3A）显示出快速的光致异构化，快速的热恢复和良好的抗疲劳性。通过与pPEGMEMA嵌段（pPEGMEMA₂₀ - b- pMAEMA₂₉，样品4）。相对于均聚物和自由模型DASA，亲水性pPEGMEMA嵌段可稳定DSO在DMSO溶液中的有色异构体。由聚合物长度引起的局部环境相对较小的变化会导致装饰聚合物链的DASA单元的开关性能发生显着变化，从而强调了在将其应用于更复杂的系统之前，建议对DASA行为进行详细的了解。

更新日期：2019-11-05

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南