New fabrication approach to develop a high birefringence photo-crosslinked film based on a sulfur-containing liquid crystalline molecule with large temperature dependence of birefringence
New fabrication approach to develop a high birefringence photo-crosslinked film based on a sulfur-containing liquid crystalline molecule with large temperature dependence of birefringence
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DOI：
10.1080/15421406.2018.1467619
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发表时间：
2018-02
影响因子：
0.7
通讯作者：
Y. Arakawa;Hiroki Kuwahara;M. Tokita;G. Konishi;H. Tsuji
中科院分区：
文献类型：
--
作者：
Y. Arakawa;Hiroki Kuwahara;M. Tokita;G. Konishi;H. Tsuji
摘要我们提出了一种新的制备高双折射薄膜的方法，该方法是基于一种含有烷基硫基的棒状液晶分子的光聚合方法，该分子表现出很大的双折射温度依赖性。我们设计了一种新的具有烷基硫键的活性介孔分子(BPM-S)。研究发现，与市售的烷氧基类似物LC 242相比，BPM-S的双折射随温度的降低有更大的增量。这一结果可以被认为是由于基于广角X射线测量的侧向相邻分子的接近和环状向列相的倾向，增强了烷基硫基介元的分子间吸引相互作用。BPM-S的单轴光聚合膜表现出比LC 242更高的双折射。
ABSTRACT We present a new fabrication approach to achieve a high birefringence film by means of photopolymerization based on an alkylthio-containing rod-like liquid crystalline molecule exhibiting large temperature dependence of birefringence. We designed a new reactive mesogen having alkylthio linkages (BPM–S). It was found that BPM–S had a larger increment of birefringence with decreasing temperature, relative to commercially available alkoxy analog LC242. This result could be thought to be due to enhanced intermolecular attractive interaction for an alkylthio mesogen implied by the proximity of laterally neighboring molecules and cybotactic nematic tendency based on wide-angle X-ray measurement. The uniaxially-aligned photo-polymerized film for BPM–S showed higher birefringence than that for LC 242.