Visible-Light-Responsive Azopolymers with Inhibited π-π Stacking Enable Fully Reversible Photopatterning
Visible-Light-Responsive Azopolymers with Inhibited π-π Stacking Enable Fully Reversible Photopatterning
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DOI：
10.1021/acs.macromol.6b01367
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发表时间：
2016-09-13
期刊：
影响因子：
5.5
通讯作者：
Wu, Si
中科院分区：
文献类型：
--
作者：
Weis, Philipp;Wang, Dongsheng;Wu, Si
光开关聚合物是一种很有前途的信息存储候选材料。然而，用于可重写光存储的可光开关聚合物的两个普遍问题是光漂白和固态下的低效开关过程。为了克服这两个障碍，我们合成了一种新型的可见光可开关偶氮苯聚合物(偶氮聚合物)，该聚合物具有不可堆叠的偶氮发色团，用于可逆和稳定的信息存储。新型偶氮聚合物(PmAzo)在聚合物侧链上含有邻甲氧基偶氮苯(Mazo)基团，利用不同波长的可见光进行可逆的反式到顺式或顺式到反式的异构化反应。与传统的紫外光响应型偶氮聚合物相比，PmAzo更适合用于可逆光存储，因为可见光避免了紫外光造成的光损伤。此外，Mazo基团在固态下不会发生pi-pi堆叠，这使得PmAzo的光致发光完全可逆。此外，PmAzo上的光诱导图案可以保存半年以上。这些性质使PmAzo成为一种很有前途的可重写和稳定的信息存储候选材料。
Photoswitchable polymers are promising candidates for information storage. However, two general problems for photoswitchable polymers used in rewritable optical storage are photobleaching and inefficient switching processes in solid state. To overcome both of these obstacles, we demonstrate the synthesis of a new visible-light-switchable azobenzene-containing polymer (azopolymer) with nonstackable azo chromophores for reversible and stable information storage. The new azopolymer (PmAzo) contains ortho-methoxy-substituted azobenzene (mAzo) groups on the polymer side chains and shows reversible trans-to-cis or cis-to-trans isomerization by using distinct wavelengths of visible light. PmAzo is better suited for reversible optical storage than conventional UV-responsive azopolymers because visible light avoids the photodamage caused by UV light. Additionally, mAzo groups do not pi-pi stack in solid state, making photopatterning of PmAzo fully reversible. Moreover, photoinduced patterns on PmAzo can be stored for more than half a year. These properties distinguish PmAzo as a promising candidate for rewritable and stable information storage.