A photo-switchable ionic liquid solvent bearing an azobenzene moiety induced a viscoelastic change of block copolymer ion gels by light. ABA triblock copolymers having poly(phenethyl methacrylate) and poly(benzyl methacrylate) as A blocks exhibited opposite photoinduced rheological responses although they had only a tiny structural difference in the alkyl chain length.

中文翻译：

---

光触发偶氮苯离子液体中的嵌段共聚物离子凝胶的粘弹性变化†

带有偶氮苯部分的光可切换离子液体溶剂通过光诱导了嵌段共聚物离子凝胶的粘弹性变化。具有聚（甲基丙烯酸苯乙酯）和聚（甲基丙烯酸苄酯）作为A嵌段的ABA三嵌段共聚物显示相反的光致流变响应，尽管它们在烷基链长度上仅有微小的结构差异。