Miyagi K, Teramoto Y
Department of Applied Life Science, Faculty of Applied Biological Sciences, Gifu University Gifu 501-1193 Japan
Center for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University Gifu 501-1193 Japan.
RSC Adv. 2018 Jul 10;8(44):24724-24730. doi: 10.1039/c8ra04878a. eCollection 2018 Jul 9.
We investigated conditions to prepare cellulosic cholesteric liquid crystalline (ChLC) films in order to accomplish dual mechanochromism, , colour control and circular dichroic inversion upon mechanical stimulus, at room temperature. Flexible propionylated hydroxypropyl cellulose (PHPC) was prepared by a simple reaction and found to be capable of forming lyotropic ChLC in various monomeric solvents. The ChLC solutions were subjected to polymerization to obtain PHPC/synthetic polymer composite films incorporating the ChLC structure. However, the immobilization behaviour depended on the type of original monomers. Differential scanning calorimetry and solid-state NMR measurement revealed that the ChLC structure was more highly fixed when the compatibility between PHPC and the coexisting polymers was lower. Eventually, thus obtained ChLC composite films exhibited dual mechanochromism under ambient temperature.
我们研究了制备纤维素胆甾型液晶（ChLC）薄膜的条件，以便在室温下实现双重机械变色，即机械刺激下的颜色控制和圆二色性反转。通过简单反应制备了柔性丙酰化羟丙基纤维素（PHPC），发现其能够在各种单体溶剂中形成溶致性ChLC。对ChLC溶液进行聚合，以获得包含ChLC结构的PHPC/合成聚合物复合薄膜。然而，固定行为取决于原始单体的类型。差示扫描量热法和固态核磁共振测量表明，当PHPC与共存聚合物之间的相容性较低时，ChLC结构固定得更好。最终，由此获得的ChLC复合薄膜在环境温度下表现出双重机械变色。
