Title
Exploration of immobilization conditions of cellulosic lyotropic liquid crystals in monomeric solvents by in situpolymerization and achievement of dual mechanochromism at room temperature
Author
K. Miyagi, Y. Teramoto
Year
2018
Journal
RSC Advances
Abstract
We investigated conditions to prepare cellulosic cholesteric liquid crystalline (ChLC) films in order to accomplish dual mechanochromism, i.e., 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 in situ 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.
Instrument
J-820
Keywords
Circular dichroism, Polymers, Chemical stability, Materials