scholarly journals Induction of Polyacetylene to a Chiral Smectic Liquid Crystal–Chiral Direct Conversion

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1547
Author(s):  
Akiko Yatsu ◽  
Takuya Yonehara ◽  
Hiromasa Goto
Keyword(s):  
Liquid Crystal ◽  
Chemical Interaction ◽  
Helical Structure ◽  
Direct Conversion ◽  
Side Chain ◽  
Iodine Doping ◽  
Liquid Crystallinity ◽  
Smectic C ◽  
Smectic Liquid Crystal ◽  
Crystal Polymer

The synthesis of polyacetylene-bearing pyrimidine-type three-ringed mesogenic core exhibiting smectic C (SmC) characteristics was conducted. Gas-phase iodine doping of the polymer provided evidence of chemical interaction between the polyene and iodine, which acted as an electron acceptor. The side-chain fluorine atom tilted the mesogen moiety to form SmC as a tilted liquid crystal. The addition of a small amount of chiral inducer yielded SmC* of the polymer as the chiral version of SmC. The liquid crystallinity and electronic properties of the π-conjugated chiral liquid crystal polymer with a helical structure were evaluated.

scholarly journals Engineering Achiral Liquid Crystalline Polymers for Chiral Self-Recovery

2021 ◽  
Vol 22 (21) ◽  
pp. 11980
Author(s):  
Tengfei Miao ◽  
Xiaoxiao Cheng ◽  
Yilin Qian ◽  
Yaling Zhuang ◽  
Wei Zhang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Uv Light ◽  
Helical Structure ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Polymeric Liquid ◽  
Crystalline Polymers ◽  
Liquid Crystal System ◽  
And Storage

Flexible construction of permanently stored supramolecular chirality with stimulus-responsiveness remains a big challenge. Herein, we describe an efficient method to realize the transfer and storage of chirality in intrinsically achiral films of a side-chain polymeric liquid crystal system by combining chiral doping and cross-linking strategy. Even the helical structure was destroyed by UV light irradiation, the memorized chiral information in the covalent network enabled complete self-recovery of the original chiral superstructure. These results allowed the building of a novel chiroptical switch without any additional chiral source in multiple types of liquid crystal polymers, which may be one of the competitive candidates for use in stimulus-responsive chiro-optical devices.

Rheology and Morphology of Smectic Liquid Crystal/Polymer Blends

2004 ◽  
Vol 37 (17) ◽  
pp. 6424-6432 ◽  
Author(s):  
Jun Yonezawa ◽  
Stephen M. Martin ◽  
Christopher W. Macosko ◽  
Michael D. Ward
Keyword(s):  
Liquid Crystal ◽  
Polymer Blends ◽  
Liquid Crystal Polymer ◽  
Smectic Liquid Crystal ◽  
Crystal Polymer

SIDE CHAIN LIQUID CRYSTAL POLYMERS FOR QUADRATIC NONLINEAR OPTICS

1996 ◽  
Vol 05 (04) ◽  
pp. 735-755 ◽  
Author(s):  
D. GONIN ◽  
B. GUICHARD ◽  
M.C.J. LARGE ◽  
T. DANTAS DE MORAIS ◽  
C. NOËL ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Statistical Models ◽  
Liquid Crystalline ◽  
Nonlinear Optical ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Mesogenic Group ◽  
Liquid Crystallinity ◽  
Polar Order

In this paper we consider the behavior of a number of side chain liquid crystal polymers having the same mesogenic group and relate their liquid crystalline behavior to their polarization and nonlinear optical properties. We show that the liquid crystallinity of the materials results in an enhancement of the polar order over that of isotropic materials, in qualitative agreement with molecular statistical models.

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