Nonelectric Sustaining Bistable Polymer Framework Liquid Crystal Films with a Novel Semirigid Polymer Matrix
Nonelectric Sustaining Bistable Polymer Framework Liquid Crystal Films with a Novel Semirigid Polymer Matrix
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具有新型半刚性聚合物基质的非电维持双稳态聚合物框架液晶薄膜
DOI：
10.1021/acsami.8b06324
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发表时间：
2018-07-04
影响因子：
9.5
通讯作者：
Zhang, Lanying
中科院分区：
文献类型：
--
作者：
Hu, Wei;Chen, Mei;Zhang, Lanying
在这项工作中，一个聚合物骨架液晶（PFLC）薄膜通过热固化的环氧单体与两种不同的硫醇，一个传统的柔性结构的硫醇和一个新的原始刚性结构的硫醇，已成功地制备，结合了一种新的混合形态的聚合物基体和液晶的负介电各向异性。聚合物骨架形态是通过两种类型的环氧单体与两种类型的硫醇固化而形成的，并且液晶在PFLC膜中的初始状态下倾向于具有大尺寸域的焦锥织构，使得其在透明状态和不透明状态之间具有适度的光透射。因此，基于PFLC膜的器件可以通过交变电场在透明状态和不透明状态之间可逆地切换。此外，在去除电场后，这些状态可以维持。记忆效应来源于聚合物骨架在PFLC微区中的锚定效应。因此，优化后的双折射PFLC膜在通过施加瞬时电场改变状态后，在没有外部电场和任何其他能量消耗的情况下长时间保持其初始状态。该薄膜中特殊的聚合物骨架结构赋予了薄膜优异的电光性能和力学性能。该器件具有高能效和低成本的特点，在节能反射式显示器、电子纸、书写板和智能窗等方面具有巨大的应用潜力。
In this work, a bistable polymer framework liquid crystal (PFLC) thin film by thermal curing of epoxy monomers with two different thiols, a traditional flexible-structure thiol and a novel original rigid-structure thiol, has been successfully fabricated, combining a novel mixed morphology of polymer matrix and cholesteric liquid crystals with negative dielectric anisotropy. The polymer framework morphology has been formed by curing two types of epoxy monomers with two types of thiols, and the liquid crystals tend to be focal conic textures with large size domains at the initial state in the PFLC film so that it has a moderate light transmissivity at this state between the transparent state and the opaque state. Thus, the devices based on PFLC films can be switched reversibly between the transparent state and the opaque state by alternative electric field. In addition, the states can be sustained after the electric field is removed. The bistable memory effect comes from the anchoring effects of the polymer frameworks with a novel morphology in the microdomains of the PFLCs. Therefore, the optimized bistable PFLC film keeps its initial state without external electric field and any other energy consumption for a long time after altering the state by applying an instant electric field. The special polymer frameworks in the bistable PFLC films endow the films with excellent electrooptical properties and mechanical properties. The devices are energy-efficient and cost-saving and have great potential applications in energy-efficient reflective displays, electronic papers, writing tablets, and smart windows.