Liquid Crystalline Conjugated Polymers
with Optoelectronic Functions
12
Kazuo Akagi
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Generation of Monodomain Structures of Mono-substituted LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Structures and Liquid Crystallinity of the Mono-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
Macroscopic Alignment and Linearly Polarized Luminescence of Di-substituted
LC Polyacetylene Derivatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
Synthesis and Structures of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Absorption and Photoluminescence of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Liquid Crystallinity of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Linearly Polarized Luminescence of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Cross-References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Abstract
We review the recent progress in advanced functionalities of liquid crystalline
polyacetylenes (LCPAs). We focus on properties and functionalities that
include electrical anisotropy and linearly polarized luminescence (LPL). First,
the synthesis of mono-substituted LCPAs using Fe-based Ziegler–Natta catalyst is
briefly reviewed. The mono-LCPAs exhibit enantiotropic S A phases resulting
from spontaneous orientation of the LC side chain. Iodine doping of monoLCPA cast films followed by macroscopic alignment of the main chain accompanied by the side chain orientation using an external magnetic force of 0.7–1.0 T
enhanced the electrical conductivity by two orders of magnitude to 10
À6 S/cm
and gave rise to a notable electrical anisotropy. Second, the synthesis of disubstituted LCPAs using metathesis catalyst that exhibit enantiotropically
K. Akagi (*)
Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Japan
e-mail: akagi@fc.ritsumei.ac.jp
© 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_46
341
with Optoelectronic Functions
12
Kazuo Akagi
Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 342
Generation of Monodomain Structures of Mono-substituted LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . 345
Structures and Liquid Crystallinity of the Mono-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
Macroscopic Alignment and Linearly Polarized Luminescence of Di-substituted
LC Polyacetylene Derivatives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347
Synthesis and Structures of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 349
Absorption and Photoluminescence of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 350
Liquid Crystallinity of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351
Linearly Polarized Luminescence of the Di-LCPAs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354
Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
Cross-References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 358
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359
Abstract
We review the recent progress in advanced functionalities of liquid crystalline
polyacetylenes (LCPAs). We focus on properties and functionalities that
include electrical anisotropy and linearly polarized luminescence (LPL). First,
the synthesis of mono-substituted LCPAs using Fe-based Ziegler–Natta catalyst is
briefly reviewed. The mono-LCPAs exhibit enantiotropic S A phases resulting
from spontaneous orientation of the LC side chain. Iodine doping of monoLCPA cast films followed by macroscopic alignment of the main chain accompanied by the side chain orientation using an external magnetic force of 0.7–1.0 T
enhanced the electrical conductivity by two orders of magnitude to 10
À6 S/cm
and gave rise to a notable electrical anisotropy. Second, the synthesis of disubstituted LCPAs using metathesis catalyst that exhibit enantiotropically
K. Akagi (*)
Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Japan
e-mail: akagi@fc.ritsumei.ac.jp
© 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_46
341