Flexible and Patterned Thin Film Polarizer: Photopolymerization of Peryl-ene-based Lyotropic Chromonic Reactive Mesogens
Flexible and Patterned Thin Film Polarizer: Photopolymerization of Peryl-ene-based Lyotropic Chromonic Reactive Mesogens
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DOI：
10.1021/acsami.5b09995
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发表时间：
2016-01-13
影响因子：
9.5
通讯作者：
Jeong, Kwang-Un
中科院分区：
文献类型：
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作者：
Im, Pureun;Kang, Dong-Gue;Jeong, Kwang-Un
设计并合成了一种可形成溶致变色液晶相的二萘嵌苯基反应性液晶元（DAPDI），用于在柔性聚合物基底上制备宏观取向和图案化的薄膜偏振器（TFP）。利用显微镜、散射和光谱技术研究了DAPDI的各向异性光学性质和分子自组装。分子自组装的主要驱动力是芳香核之间面对面的π-π分子间相互作用和亲水性离子基团与疏水性芳香核之间的纳米相分离。在λ（max）= 491 nm处，宏观取向和光聚合的DAPDI TFP的偏振度估计为99.81%。在柔性聚合物基底上机械剪切DAPDI LCLC水溶液后，我们成功地通过在光聚合过程中蚀刻由光掩模选择性阻挡的未聚合区域来制造图案化的DAPDI TFP。通过溶剂和铅笔硬度测试证实了化学和机械稳定性，并通过光学显微镜，原子力显微镜和三维表面纳米轮廓仪进一步研究了其表面形貌。具有良好化学稳定性和机械稳定性的柔性和图案化DAPDI TFP可以成为先进柔性光电子器件的垫脚石。
A perylene-based reactive mesogen (DAPDI) forming a lyotropic chromonic liquid crystal (LCLC) phase was newly designed and synthesized for the fabrication of macroscopically oriented and patterned thin film polarizer (TFP) on the flexible polymer substrates. The anisotropic optical property and molecular self-assembly of DAPDI were investigated by the combination of microscopic, scattering and spectroscopic techniques. The main driving forces of molecular self-assembly were the face-to-face pi-pi intermolecular interaction among aromatic cores and the nanophase separation between hydrophilic ionic groups and hydrophobic aromatic cores. Degree of polarization for the macroscopically oriented and photopolymerized DAPDI TFP was estimated to be 99.81% at the lambda(max) = 491 nm. After mechanically shearing the DAPDI LCLC aqueous solution on the flexible polymer substrates, we successfully fabricated the patterned DAPDI TFP by etching the unpolymerized regions selectively blocked by a photomask during the photopolymerization process. Chemical and mechanical stabilities were confirmed by the solvent and pencil hardness tests, and its surface morphology was further investigated by optical microscopy, atomic force microscopy, and three-dimensional surface nanoprofiler. The flexible and patterned DAPDI TFP with robust chemical and mechanical stabilities can be a stepping stone for the advanced flexible optoelectronic devices.