Earticle

초록

영어

Mechanochromism is a stress-induced color change of materials and motivates smart applications such as stress-sensing, material damage-reporting, and information security. The principles to give mechanochromism include mechanophore, aggregation-induced emission, and structural colors. Cholesteric liquid crystal (ChLC) exhibits a structural color based on its selective reflection of circularly polarized light (CPL). Several cellulose derivatives are capable of expressing ChLC and can be a key component to produce mechanochromic materials. We have recently found that polymerized composites of ChLC solution of ethyl cellulose in acrylic acid demonstrated not only wide-ranging color change but also circular dichroic inversion upon mechanical stimulus at >120°C. Their original color and circular dichroism were recovered by post-thermal treatment. For propionylated hydroxypropyl cellulose, ChLC structure could be immobilized with various monomers, to which the contribution of hydrogen bonding and moderate compatibility was confirmed spectroscopically [Polymer 2019]. The extension of applicable monomers led to wide-ranging control of temperature and stress for mechanochromism expression. Most recently, we have succeeded in elucidating the effect of birefringence to the inversion of CPL handedness and simulating the mechanochromism. Cellulose-based ChLC is thus a promising material for smart mechanochromic material design.

키워드

저자

• Kazuma Miyagi [ Department of Applied Life Science, Gifu University, Gifu 5011193, Japan; Present address: Department of Forest Resource Chemistry, Forestry and Forest Products Research Institute, Tsukuba, Ibaraki 3058687, Japan ]
• Yoshikuni Teramoto [ Division of Forest and Biomaterials Science, Kyoto University, Kyoto 6068502, Japan ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  강원대학교 산림과학연구소 학술대회

• 간기

  부정기

• 수록기간

  2017~2024

• 십진분류

  KDC 526 DDC 634