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首页> 外文期刊>ACS applied materials & interfaces >Reprogrammable, Reprocessible, and Self-Healable Liquid Crystal Elastomer with Exchangeable Disulfide Bonds
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Reprogrammable, Reprocessible, and Self-Healable Liquid Crystal Elastomer with Exchangeable Disulfide Bonds

机译：具有可交换二硫键的可再编程，可再生和自我恢复的液晶弹性体

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摘要

A liquid crystal elastomer (LCE) can be regarded as an integration of mesogenic molecules into a polymer network. The LCE can generate large mechanical actuation when subjected to various external stimuli. Recently, it has been extensively explored to make artificial muscle and multifunctional devices. However, in the commonly adopted two-step crosslinking method for synthesizing monodomain LCEs, the LCE needs to be well-cross-linked in the first step before stretching, which increases the disorder of mesogenic molecules in the final state of the LCE and makes it very challenging to fabricate the LCE of complex shapes. In this article, we developed a new LCE with disulfide bonds, which can be reprogrammed from the polydomain state to the monodomain state either through heating or UV illumination, owing to the rearrangement of the polymer network induced by the metathesis reaction of disulfide bonds, In addition, the newly developed LCE can be easily reprocesed and self-healed by heating. Because of the excellent reprogrammability as well as reprocessability of the LCE, we further fabricated LCE-based active micropillar arrays through robust imprint lithography, which can be hardly achieved using the LCE prepared previously. Finally, we showed an excellent long-team durability of the newly developed LCE.
机译：液晶弹性体（LCE）可被认为是介晶分子在聚合物网络中的整合。当受到各种外部刺激时，LCE可以产生大的机械致动。最近，已广泛探索制作人工肌肉和多功能设备。然而，在普通采用的两步交联方法中，用于合成单域LCE，LCE需要在拉伸之前在第一步中交联，这增加了LCE的最终状态下介性分子的病症非常具有挑战性，制造复杂形状的LCE。在本文中，我们开发了一种具有二硫键的新型LCE，其可以通过加热或紫外线照明从多群状态重新编程到单颗粒状态，由于二硫键的复分解反应诱导的聚合物网络，在此外，新开发的LCE可以通过加热容易地重新恢复和自愈。由于LCE的优异重新编程性以及再循环性，我们通过强大的压印光刻进一步制造了基于LCE的有源微米阵列，这可以使用先前制备的LCE几乎不能实现。最后，我们展示了新开发的LCE的优秀长期持久性。

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