Substituted naphthalimide (NI) moieties are highly versatile and newly recognized aggregation‐induced emission (AIE) building blocks for many potentially useful smart molecules, polymers, and nanoparticles. However, the introduction of NI fluorophore into cross‐linked polymeric networks to prepare AIE‐active hydrogels still remains underdeveloped. Herein, a novel naphthalimide‐based aggregation‐induced emissive polymeric hydrogel is reported, followed by its proof‐of‐concept applications as fluorescence pattern switch and biomimetic actuator. The hydrogel, bearing semi‐interpenetrating polymer networks, is synthesized starting from N‐isopropylacrylamide, hydroxyethyl methacrylate, and a newly designed NI monomer (4‐phenoxy‐N‐allyl‐1,8‐naphthalimide, PhAN). Rational molecular design for AIE‐active PhAN monomer lies in modification of the NI core with rigid and bulky phenoxy group to break its planarity to produce desirable propeller‐shaped molecular conformation. The as‐prepared hydrogel is proved to be a aggregation‐induced blue‐light‐emitting hydrogel. It also shows volume phase transition behavior and is endowed with thermally responsive synergistic emission and transmittance change, thus enabling simultaneous regulation of two optical properties merely by one single stimulus. These useful advantages further encourage fabrication of several proto‐type fluorescence pattern switching and biomimetic actuating devices. This study may not only enlarge the list of fluorescent hydrogels but also serve as a novel smart optical platform for potential anticounterfeiting, sensing, displaying, or actuating applications.

中文翻译：

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基于萘二甲酰亚胺的聚集诱导发光聚合物水凝胶，用于荧光模式转换和仿生作动器。

取代的萘二甲酰亚胺（NI）部分具有高度的通用性，是许多潜在有用的智能分子，聚合物和纳米粒子的最新公认的聚集诱导发射（AIE）构建基块。但是，将NI荧光团引入交联的聚合物网络以制备AIE活性水凝胶的方法仍不完善。本文报道了一种新型的基于萘二甲酰亚胺的聚集诱导的发射聚合物水凝胶，随后报道了其概念验证应用，如荧光模式转换和仿生致动器。带有半互穿聚合物网络的水凝胶由N异丙基丙烯酰胺，甲基丙烯酸羟乙酯和新设计的NI单体（4-苯氧基N-烯丙基-1,8-萘二甲酰亚胺（PhAN）。AIE活性PhAN单体的合理分子设计在于用刚性笨重的苯氧基修饰NI核，以破坏其平面性，以产生理想的螺旋桨状分子构象。所制备的水凝胶被证明是聚集诱导的发蓝光的水凝胶。它还显示了体积相变行为，并具有热响应协同发射和透射率变化，因此仅通过一个刺激即可同时调节两个光学特性。这些有用的优点进一步鼓励了几种原型荧光图案转换和仿生驱动装置的制造。这项研究不仅可以扩大荧光水凝胶的范围，而且还可以作为一种新型的智能光学平台，用于潜在的防伪，