Anisotropic Liquid Crystal Networks from
Reactive Mesogens
4
Dae-Yoon Kim, Namil Kim, and Kwang-Un Jeong
Contents
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Reactive Mesogens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Anisotropic LC Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Anisotropic LC Gels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Conclusions and Future Directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Abstract
Anisotropic liquid crystal (LC) networks prepared from reactive mesogens (RMs)
have numerous advantages in optoelectronic devices especially because of the
excellent processability. To fabricate the robust thin LC film with excellent
thermal, chemical, and mechanical stability, the photopolymerization of the
anisotropically pre-oriented RMs should be conducted under optimized conditions. Since the final physical properties of an anisotropic LC network depend on
chemical functions and physical intermolecular interactions, the hierarchical
superstructures of the programmed RMs with specific chemical functions must
D.-Y. Kim · K.-U. Jeong (*)
Polymer Materials Fusion Research Center and Department of Polymer-Nano Science and
Technology, Chonbuk National University, Jeonju, Jeonbuk, South Korea
e-mail: kujeong@jbnu.ac.kr
N. Kim
Smart Materials R&D Center, Korea Automotive Technology Institute, Cheonan, Chungnam,
South Korea
e-mail: nikim@katech.re.kr
© Springer Nature Switzerland AG 2020
L. Zhu, C. Y. Li (eds.), Liquid Crystalline Polymers, Polymers and Polymeric
Composites: A Reference Series, https://doi.org/10.1007/978-3-030-43350-5_57
95
Reactive Mesogens
4
Dae-Yoon Kim, Namil Kim, and Kwang-Un Jeong
Contents
Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Reactive Mesogens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Anisotropic LC Networks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
Anisotropic LC Gels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Conclusions and Future Directions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
Abstract
Anisotropic liquid crystal (LC) networks prepared from reactive mesogens (RMs)
have numerous advantages in optoelectronic devices especially because of the
excellent processability. To fabricate the robust thin LC film with excellent
thermal, chemical, and mechanical stability, the photopolymerization of the
anisotropically pre-oriented RMs should be conducted under optimized conditions. Since the final physical properties of an anisotropic LC network depend on
chemical functions and physical intermolecular interactions, the hierarchical
superstructures of the programmed RMs with specific chemical functions must
D.-Y. Kim · K.-U. Jeong (*)
Polymer Materials Fusion Research Center and Department of Polymer-Nano Science and
Technology, Chonbuk National University, Jeonju, Jeonbuk, South Korea
e-mail: kujeong@jbnu.ac.kr
N. Kim
Smart Materials R&D Center, Korea Automotive Technology Institute, Cheonan, Chungnam,
South Korea
e-mail: nikim@katech.re.kr
© Springer Nature Switzerland AG 2020
L. Zhu, C. Y. Li (eds.), Liquid Crystalline Polymers, Polymers and Polymeric
Composites: A Reference Series, https://doi.org/10.1007/978-3-030-43350-5_57
95