| 학회 |
한국고분자학회 |
| 학술대회 |
2016년 봄 (04/06 ~ 04/08, 대전컨벤션센터) |
| 권호 |
41권 1호 |
| 발표분야 |
기능성 고분자 |
| 제목 |
Thermal- and Photo-Induced Phase-Transition Behaviors of a Ribbon-shaped Chiral Liquid Crystalline Dendrimer |
| 초록 |
A ribbon-shaped tapered dendritic liquid crystal with photochromic azobenzene mesogens and an isosorbide chiral center (abbreviated as AZ3DLC) was successfully synthesized and its major phase transitions were studied by using differential scanning calorimetry (DSC) and linear polarized optical microscopy (POM). Its ordered structures at different temperatures were further identified through structure-sensitive diffraction techniques. It was found that the AZ3DLC molecule exhibited the low-ordered chiral smectic (Sm*) LC phase with 6.31 nm periodicity at a high-temperature phase region. AZ3DLC showed the reversible photoisomerization in both organic solvents and nematic (N) LC media. Based on the experimental results, we were able to reversibly “remote-control” the colors in the whole visible region by finely tuning the helical pitch of the spontaneously formed helical superstructures. This work was mainly supported by BRL (2015042417) and BK21 PLUS program, Korea. |
| 저자 |
박민욱, 김대윤, 정광운
|
| 소속 |
전북대 |
| 키워드 |
chiral LC; azobenzene mesogens
|
| E-Mail |
|
