平衡高性能胆甾型液晶物理凝胶的相容性和胶凝性,Langmuir

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平衡高性能胆甾型液晶物理凝胶的相容性和胶凝性
Langmuir ( IF 3.7 ) Pub Date : 2023-01-03 , DOI: 10.1021/acs.langmuir.2c02626
Huan Ruan ₁ , Qian Jiang ₁ , Yuan Qiu ₁ , Yuping Zhang ₁ , Yonggui Liao _{1,

2} , Xiaolin Xie _{1,

2}

Affiliation

液晶物理凝胶 (LCPG) 由于其机械性能和刺激响应行为而引起越来越多的关注。然而，由于它们的凝胶剂特性，如热稳定性、凝胶能力和液晶相容性，开发具有高性能的 LCPGs 仍然是一个巨大的挑战性任务。在此，四种新型凝胶剂 (( l )-PH、( d )-PH、( l )-P2H 和 ( d)-P2H)基于1,4-苯二甲酰胺苯丙氨酸衍生物设计合成了含有一个或两个乙二醇基团。发现乙二醇基团对提高凝胶剂与液晶的相容性起着重要作用。所有制备的化合物都可以在 P0616A 中形成稳定的 LCPG。特别是，具有 9.0 wt% ( l )-PH 和一个乙二醇单元的 LCPG 的储能模量高于 10 ⁶ Pa，这与 SmC 凝胶相似并且优于先前报道的向列型 LCPG。此外，制备的凝胶显示出强烈的棉花效应，具有手偏好的扭曲纤维网络和 ( l)-PH可诱导P0616A形成胆甾型指纹结构。因此，这些低分子量凝胶剂提供了构建高性能胆甾型 LCPG 以实现 LC 器件应用的策略。

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Balancing Compatibility and Gelability for High-Performance Cholesteric Liquid Crystalline Physical Gels

Liquid crystalline physical gels (LCPGs) have attracted increasing interest because of their mechanical properties and stimulus–response behaviors. However, due to their gelator properties such as thermal stability, gelation capability, and compatibility in liquid crystals, development of LCPGs with high performances still remains a huge challenging task. Herein, four novel gelators ((l)-PH, (d)-PH, (l)-P2H, and (d)-P2H) based on 1,4-benzenedicarboxamide phenylalanine derivatives containing one or two ethylene glycol groups have been designed and synthesized. It is found that the ethylene glycol group plays a significant role in improving the compatibility between the gelator and the liquid crystal. All of the prepared compounds can form stable LCPGs in P0616A. In particular, the storage modulus of LCPG with 9.0 wt % of (l)-PH with one ethylene glycol unit is higher than 10⁶ Pa, which is similar to SmC gels and advantageous over previously reported nematic LCPGs. Furthermore, the prepared gels display a strong Cotton effect with hand-preferred twisted fiber networks and the self-assembled aggregates of (l)-PH can induce P0616A to form a cholesteric fingerprint structure. Thus, these low molecular weight gelators provide a strategy to construct high-performance cholesteric LCPGs for the realization of LC device applications.

更新日期：2023-01-03

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