Liquid crystal elastomers (LCEs) with intrinsic anisotropic strains are reversible shape‐memory polymers of interest in sensor, actuator, and soft robotics applications. Rapid gelation of LCEs is required to fix molecular ordering within the elastomer network, which is essential for directed shape transformation. A highly efficient photo‐cross‐linking chemistry, based on two‐step oxygen‐mediated thiol–acrylate click reactions, allows for nearly instant gelation of the main‐chain LCE network upon exposure to UV light. Molecular orientation from the pre‐aligned liquid crystal oligomers can be faithfully transferred to the LCE films, allowing for preprogrammed shape morphing from two to three dimensions by origami‐ (folding‐only) and kirigami‐like (folding with cutting) mechanisms. The new LCE chemistry also enables widely tunable physical properties, including nematic‐to‐ isotropic phase‐transition temperatures (T_N‐I), glassy transition temperatures (T_g), and mechanical strains, without disrupting the LC ordering.

中文翻译：

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氧气介导的硫醇-丙烯酸酯点击反应可即时锁定液晶弹性体中的分子有序

具有固有各向异性应变的液晶弹性体（LCE）是可逆的形状记忆聚合物，在传感器，执行器和软机器人应用中受到关注。需要LCE快速凝胶化以固定弹性体网络内的分子有序性，这对于定向形状转换至关重要。基于两步氧介导的硫醇丙烯酸酯点击反应的高效光交联化学反应，使主链LCE网络在暴露于紫外线后几乎可以立即凝胶化。预对齐的液晶低聚物的分子取向可以如实地转移到LCE膜上，从而可以通过折纸（仅折叠）和类似折纸（切割折叠）的机制将编程的形状从二维变形为三维。新的LCE化学成分还可以实现广泛可调的物理特性，T _N-1），玻璃化转变温度（T _g）和机械应变，而不会破坏LC的顺序。