Anisotropic 1D contraction motion of polymeric actuating materials has drawn growing interests in fields ranging from soft robotics to biomimetic muscles. Although light‐driven liquid crystal polymers (LCPs) represent promising candidates to realize contraction (<20%) triggered remotely and spatially, there remain multitudes of challenges to develop an LCP system possessing ultralarge contraction rate. Here, a novel strategy combining shape memory effect and photochemical phase transition is presented to realize light‐driven contraction as large as 81% in a newly designed linear liquid crystal copolymer, where the eutectic mesogens of azobenzene and phenyl benzoate self‐organize into the smectic B phase. Importantly, this highly ordered structure as the switching segment firmly locks the stress‐induced strain energy, which is rapidly released by reversible trans –cis photoisomerization that destroys the lamellar liquid crystal phase, therefore leading to such ultralarge contraction. Fibers serve as light‐driven building blocks to achieve precise origami, to mimic the recovery of a “broken” spider web and to screen objects in different sizes, laying new ground for advanced applications of light‐driven LCPs from biomimetic robots to human assists.

中文翻译：

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线性液晶聚合物纤维中预存储的应变能的光驱动解锁指导超大收缩

聚合物驱动材料的各向异性一维收缩运动引起了从软机器人到仿生肌肉等领域的日益增长的兴趣。尽管光驱动液晶聚合物（LCP）代表了实现远距离和空间触发的收缩（<20％）的有希望的候选者，但是开发具有超大收缩率的LCP系统仍然面临许多挑战。在此，提出了一种结合形状记忆效应和光化学相变的新策略，以在新设计的线性液晶共聚物中实现高达81％的光驱动收缩，其中偶氮苯和苯甲酸苯酯的共晶介晶自组织成近晶状B相。重要的是，这种高度有序的结构作为开关段牢固地锁定了应力引起的应变能，反式-顺式光致异构化破坏了层状液晶相，因此导致了这种超大收缩。纤维充当光驱动的基石，以实现精确的折纸，模仿“破碎的”蜘蛛网的恢复并筛选不同尺寸的物体，从而为从仿生机器人到人工辅助的光驱动LCP的高级应用奠定了新的基础。