Synthesis and Characterization of Photo-Responsible LCEs Containing Hockey-stick-shaped Mesogen
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초록
내용
Recently, numerous studies have been made on soft actuators whose shape is reversibly changed by external stimulation. In particular, photosensitive liquid crystalline elastomers containing photochromic compounds such as azobenzene or spiropyran groups are attracting attention. Remote and local operation can be controlled via light without changing the surroundings. In many studies, acrylate-based LCEs mainly containing RM257 and azobenzene derivatives have been reported. In this study, the hockey-stick-shaped mesogenic group was introduced to maximize the volume change of the LCE film. Concretely, azobenzene-based, rod-like, and hockey-stick-shaped reactive mesogens were synthesized. The structure of obtained RMs was identified by FTIR and 1H-NMR spectrometry. Thermal and liquid crystal properties were investigated by using DSC and POM. To evaluate the photo-response properties, LCE films were prepared by surface alignment and photocuring in appropriate mixing ratios of the RMs.