Photoinduced reversible solid-to-liquid transitions of azobenzene-containing materials can control adhesion. Photoswitchable adhesives based on azobenzene-containing small molecules and polymers are under intense investigation. The melting points or glass transition temperatures of such azobenzene-containing materials in trans and cis forms are above and below room temperature, respectively. Photoswitching of these materials results in reversible trans-cis isomerization and solid-to-liquid transitions. The solid trans azobenzene-containing materials have strong adhesion and the liquid cis azobenzene-containing materials have weaker adhesion. In this Minireview, we introduce adhesives based on azobenzene-containing small molecules and polymers. The remaining challenges and perspectives in the field of photoswitchable adhesives using azobenzene-containing materials are also discussed.

中文翻译：

---

使用含偶氮苯的材料的光开关粘合剂。

含偶氮苯的材料的光诱导可逆固-液转变可以控制粘附。基于含偶氮苯的小分子和聚合物的光开关胶粘剂正在深入研究中。这种含反式和顺式的含偶氮苯的材料的熔点或玻璃化转变温度分别高于和低于室温。这些材料的光开关导致可逆的反式-顺式异构化和固-液转变。固体的含反式偶氮苯的材料具有强的粘附力，而液体的含顺式偶氮苯的材料具有较弱的粘附力。在此Minireview中，我们介绍了基于含偶氮苯的小分子和聚合物的胶粘剂。