An Azoester-containing Photoresponsive Linear Liquid Crystal Polymer with Good Mesophase Stability
An Azoester-containing Photoresponsive Linear Liquid Crystal Polymer with Good Mesophase Stability
复制标题
一种具有良好中间相稳定性的含偶氮酯的光响应线性液晶聚合物
DOI：
10.1007/s10118-020-2383-0
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发表时间：
2020-02-27
影响因子：
4.3
通讯作者：
Yu, Yan-Lei
中科院分区：
文献类型：
--
作者：
Han, Shu-Qiang;Chen, Ying-Ying;Yu, Yan-Lei
光响应性线性液晶聚合物（LLCPs）因其优异的刺激响应性和良好的加工性能而备受关注。本研究采用开环易位聚合的方法合成了一种具有良好中间相稳定性的含偶氮酯的新型光敏液晶聚合物（PC 11 AE 6）。通过引入具有高刚性和大长径比的光响应性偶氮酯介晶单元，所得聚合物具有宽的中间相温度区间（各向同性温度= 180 °C）。通过二维广角X射线衍射对介晶相的研究表明，热处理后介晶自发取向为近晶A相。取向膜和纤维在光照下表现出宏观的、快速的和可逆的变形，作为偶氮酯光异构化的结果，通过紫外-可见吸收分光光度法证实。我们预计，这项工作提供了一个策略，制备具有广泛的中间相温度范围，这是积极的潜在应用。
Photoresponsive linear liquid crystal polymers (LLCPs) are attractive because of the excellent stimuli-responsibility and the good processability. In this study, a new photoresponsive LLCP containing azoester (PC11AE6) with good mesophase stability was synthesized by ring-opening metathesis polymerization. By introducing photoresponsive azoester mesogenic unit, which has high rigidity and a large length-diameter ratio, the resultant polymer possesses a broad mesophase temperature interval (isotropic temperature = 180 °C). A study on mesophase by 2D-wide angle X-ray diffraction indicated that the mesogens were orientated spontaneously into smectic A phase after annealing. The orientated films and fibres exhibited macroscopic, rapid and reversible deformations under light irradiation as a result of the photoisomerization of azoester as confirmed by UV-Vis absorption spectrophotometry. We anticipate that this work provides a strategy for preparing LLCP with a broad mesophase temperature range, which is positive for potential applications.