Cholesteric Liquid Crystals from Cellulose Derivatives with Alkyl Ether Groups
Cholesteric Liquid Crystals from Cellulose Derivatives with Alkyl Ether Groups
复制标题
DOI：
10.2494/photopolymer.33.461
复制
发表时间：
2020-01-01
影响因子：
0.8
通讯作者：
Furumi, Seiichi
中科院分区：
文献类型：
--
作者：
Saito, Seina;Hayata, Kenichiro;Furumi, Seiichi
在本研究中，我们通过Williamson醚合成了含烷基醚侧链的羟丙基纤维素(HPC)衍生物。此类HPC醚衍生物具有布拉格反射的热致胆甾型液晶(CLCs)。通过改变HPC衍生物中的侧链长度和醚化度，可以控制反射波长的温度依赖性。此外，还对HPC酯和醚在60℃加热20天前后的热稳定性进行了评价。热处理后，由于酯键的水解，HPC酯的反射峰向长波方向移动。另一方面，我们发现，由于醚键的热稳定性，即使在长时间的热处理后，高性能聚碳醚的反射峰也能被很好地保留下来。这种合理的方法为利用纤维素醚衍生物的抗水解性来制备具有反射特性的稳定的光子CLC器件提供了有希望的线索。
In this study, we synthesized hydroxypropyl cellulose (HPC) derivatives possessing alkyl ether side chains through Williamson ether synthesis. Such HPC ether derivatives exhibited thermotropic cholesteric liquid crystals (CLCs) with Bragg reflection. The temperature dependence of reflection wavelength could be controlled by changing the side chain lengths and etherification degrees in the HPC derivatives. Moreover, the thermal stability of both HPC ester and ether was evaluated before and after heating at 60 degrees C for 20 days. The reflection peak of HPC ester shifted to the longer wavelength upon the heating treatment due to the hydrolysis of ester linkage. On the other hand, we found that the reflection peak of HPC ether can be robustly preserved even after the prolonged heating treatment, arising from the thermal stability of ether linkage. The rational approach addressed here provides promising clues to fabricate the stable photonic CLC devices with refection features by exploiting anti-hydrolysis of the cellulose ether derivatives.