He Siyang, Schog Simon, Chen Ying, Ji Yuxin, Panitz Sinan, Richtering Walter, Göstl Robert
DWI - Leibniz Institute for Interactive Materials, Forckenbeckstraße 50, 52056, Aachen, Germany.
Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany.
Adv Mater. 2023 Oct;35(41):e2305845. doi: 10.1002/adma.202305845. Epub 2023 Sep 1.
The serial connection of multiple stimuli-responses in polymer architectures enables the logically conjunctive gating of functional material processes on demand. Here, a photoswitchable diarylethene (DAE) acts as a crosslinker in poly(N-vinylcaprolactam) microgels and allows the light-induced shift of the volume phase-transition temperature (VPTT). While swollen microgels below the VPTT are susceptible to force and undergo breakage-aggregation processes, collapsed microgels above the VPTT stay intact in mechanical fields induced by ultrasonication. Within a VPTT shift regime, photoswitching of the DAE transfers microgels from the swollen to the collapsed state and thereby gates their response to force as demonstrated by the light-gated activation of an embedded fluorogenic mechanophore. This photoinduced mechanical cloaking system operates on the polymer topology level and is thereby principally universally applicable.
聚合物结构中多个刺激 - 响应的串联连接能够根据需要对功能材料过程进行逻辑合取门控。在此，一种光开关二芳基乙烯（DAE）在聚（N - 乙烯基己内酰胺）微凝胶中充当交联剂，并允许光诱导体积相变温度（VPTT）的移动。低于VPTT的溶胀微凝胶易受外力影响并经历破碎 - 聚集过程，而高于VPTT的塌陷微凝胶在超声诱导的机械场中保持完整。在VPTT移动范围内，DAE的光开关作用将微凝胶从溶胀状态转变为塌陷状态，从而控制它们对力的响应，如嵌入的荧光机械响应基团的光控激活所示。这种光诱导机械隐身系统在聚合物拓扑层面上运行，因此原则上具有普遍适用性。
