Effect of polymer backbone flexibility on blue phase liquid crystal stabilization
Effect of polymer backbone flexibility on blue phase liquid crystal stabilization
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DOI：
10.1016/j.molliq.2018.04.085
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发表时间：
2018-07
影响因子：
6
通讯作者：
Rijeesh Kizhakidathazhath;H. Higuchi;Y. Okumura;H. Kikuchi
中科院分区：
文献类型：
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作者：
Rijeesh Kizhakidathazhath;H. Higuchi;Y. Okumura;H. Kikuchi
在这项研究中，我们合成了两个新的单官能丙烯酸酯单体A0 DA和A3 DA具有苯核和十二烷基尾，然后研究它们对蓝相液晶（BPLC）稳定的影响。苯核直接连接到AODA中的丙烯酸酯单元，其形成刚性聚合物主链。而在A3 DA中，使用丙基间隔基将苯单元与丙烯酸酯基团分开，从而允许主链移动。通过在BPLC前体复合物中使用AODA作为单官能单体，在光聚合时没有看到BPLC的稳定化。有趣的是，A3 DA的使用显示了聚合后BPI晶格结构的成功稳定。这些结果证实，蓝相的稳定效果的起源是所采用的A3 DA骨架的柔性;因此，聚合物骨架的柔性被建议对BP稳定过程具有主要影响。此外，我们证明了一个低电压的电光开关的PS-BPLC建立在A3 DA，同时保持其他可取的属性的BPLC。本研究提供了有益的洞察单体设计对BPLC的稳定和增强的电光性能。
In this study, we synthesized two novel monofunctional acrylate monomers A0DA and A3DA featuring a benzene core and a dodecyl tail, and then investigated their effect on blue phase liquid crystal (BPLC) stabilization. The benzene core is directly linked to the acrylate unit in A0DA, which forms a rigid polymeric backbone. Whereas in A3DA,a propyl spacer is employed to separate the benzene unit from the acrylate group, thereby allowing backbone mobility. By using A0DA as a monofunctional monomer in the BPLC precursor composite, stabilization of BPLC was not seen upon photopolymerization. Interestingly, the use of A3DA showed successful stabilization of BPI lattice structure after polymerization. These results confirm that the origin of stabilization effect of blue phase is the flexibility of A3DA backbone employed; therefore, the polymeric backbone flexibility is suggested to have a major influence on BP stabilization process. Furthermore, we demonstrated a low voltage electro-optical switching of PS-BPLC built on A3DA, while preserving other desirable properties of BPLC. The present study provides useful insight into monomer designs towards BPLC stabilization and enhancement of electro-optical performance.