Optically Active Elastomers from Liquid Crystalline Comb Copolymers with Dual Physical and Chemical Cross-Links

2017 ◽  
Vol 50 (15) ◽  
pp. 5929-5939 ◽  
Author(s):  
Lalit H. Mahajan ◽  
Dennis Ndaya ◽  
Prashant Deshmukh ◽  
Xiayu Peng ◽  
Manesh Gopinadhan ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Optically Active ◽  
Cross Links ◽  
Physical And Chemical

Synthesis and Helical Conformation of Novel Optically Active Liquid Crystalline Poly(p-phenylene)s Containing Cyanoterphenyl Mesogen as Pendant

2009 ◽  
Vol 42 (14) ◽  
pp. 5053-5061 ◽  
Author(s):  
Lie Chen ◽  
Yiwang Chen ◽  
Kai Yao ◽  
Weihua Zhou ◽  
Fan Li ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Optically Active ◽  
Helical Conformation ◽  
Active Liquid

scholarly journals Mechanisms of Chiral Transfer in Optically Active Dopant – Nematic Liquid Crystal Systems

2020 ◽  
Vol 20 (4) ◽  
pp. 6-26
Author(s):  
V. A. Burmistrov ◽  
V. V. Aleksandriiskii ◽  
I. V. Novikov ◽  
O. I. Koifman
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
High Efficiency ◽  
Stationary Phases ◽  
Theoretical Description ◽  
Optically Active ◽  
Axial Coordination ◽  
Chiral Dopants

Induction of helical mesophases by incorporating chiral dopants into the nematics matrix is the promising modern trends in the chemistry of liquid crystals. This process is associated with a unique phenomenon - an amplification of chirality in liquid-crystalline phases, which ensures the detection of enantiomers by their chiral induction, much more sensitive than other methods. The relevance of this approach is due to the need to create perspective electro-optical devices operating with ultra-low control voltages based on twist effects, chromatographic stationary phases with high chiral selectivity, flexible magnets, photo-sensitive nanostructures, and other smart LC materials. The successful solution of these problems is impossible without experimental research and theoretical comprehension of the mechanisms of third level chiral transfer optically active dopant – nematic liquid crystal. In the last decade, a large number of works have appeared on the solution of these problems. This review is devoted to a generalization of the experimental results and a theoretical description of the transfer of molecular chirality to orientationally ordered systems with the participation of both chiral molecular substituents with an asymmetric carbon atom and planar or quasi-planar fragments chirally distorted relative to each other. The stereochemical aspects of induction associated with the structural correspondences of the dopant and nematic liquid crystal, as well as the main classes of optically active additives, are discussed. Application of metal complexes, both Werner and macroheterocyclic, are presented. Special attention is paid to the results of the mechanisms study of chiral transfer due to various intermolecular interactions: hydrogen bonding, axial coordination, and the formation of inclusion compounds. The high efficiency of induction of spiral mesophases has been demonstrated with a combination of different self-assembly mechanisms in liquid crystal - chiral additive systems.

Photo-Cross-Linkable and Optically Active Side-Chain Liquid-Crystalline Copolymers

1994 ◽  
Vol 27 (14) ◽  
pp. 3721-3726 ◽  
Author(s):  
L.-C. Chien ◽  
Leonorina G. Cada
Keyword(s):  
Liquid Crystalline ◽  
Optically Active ◽  
Side Chain

Synthesis and characterization of optically active liquid crystalline polyacrylates containing mesogenic phenylbenzoate groups

Polymer ◽  
2008 ◽  
Vol 49 (18) ◽  
pp. 3938-3949 ◽  
Author(s):  
Jui-Hsiang Liu ◽  
Yu-Kan Wang ◽  
Chien-Chih Chen ◽  
Po-Chih Yang ◽  
Feng-Ming Hsieh ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Optically Active ◽  
Synthesis And Characterization ◽  
Active Liquid

scholarly journals Supramolecular Structure, Physical Properties, and Langmuir-Blodgett Film Formation of an Optically Active Liquid-Crystalline Phthalocyanine

1995 ◽  
Vol 1 (3) ◽  
pp. 171-182 ◽  
Author(s):  
Cornelus F. van Nostrum ◽  
Anton W. Bosman ◽  
Gerwin H. Gelinck ◽  
Pieter G. Schouten ◽  
John M. Warman ◽  
...  
Keyword(s):  
Physical Properties ◽  
Supramolecular Structure ◽  
Liquid Crystalline ◽  
Film Formation ◽  
Optically Active ◽  
Blodgett Film ◽  
Langmuir Blodgett ◽  
Active Liquid ◽  
Langmuir Blodgett Film

scholarly journals From nanoscopic to macroscopic photo-driven motion in azobenzene-containing materials

Nanophotonics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 1387-1422 ◽  
Author(s):  
Stefano L. Oscurato ◽  
Marcella Salvatore ◽  
Pasqualino Maddalena ◽  
Antonio Ambrosio
Keyword(s):  
Liquid Crystalline ◽  
Large Scale ◽  
Surface Engineering ◽  
Spatial Scales ◽  
Chemical Properties ◽  
Glassy Materials ◽  
Uv Visible ◽  
Physical And Chemical ◽  
And Robotics ◽  
And Chemical Properties

AbstractThe illumination of azobenzene molecules with UV/visible light efficiently converts the molecules between trans and cis isomerization states. Isomerization is accompanied by a large photo-induced molecular motion, which is able to significantly affect the physical and chemical properties of the materials in which they are incorporated. In some material systems, the nanoscopic structural movement of the isomerizing azobenzene molecules can be even propagated at macroscopic spatial scales. Reversible large-scale superficial photo-patterning and mechanical photo-actuation are efficiently achieved in azobenzene-containing glassy materials and liquid crystalline elastomers, respectively. This review covers several aspects related to the phenomenology and the applications of the light-driven macroscopic effects observed in these two classes of azomaterials, highlighting many of the possibilities they offer in different fields of science, like photonics, biology, surface engineering and robotics.

Liquid crystalline vinylcyclopropane derivatives bearing cholesteryl side groups: synthesis, characterization and polymerization

e-Polymers ◽  
2002 ◽  
Vol 2 (1) ◽  
Author(s):  
Valentina Alupei ◽  
Helmut Ritter
Keyword(s):  
Phase Transition ◽  
Nmr Spectroscopy ◽  
Carboxylic Acid ◽  
Ir Spectroscopy ◽  
Radical Polymerization ◽  
Liquid Crystalline ◽  
Optically Active ◽  
H Nmr

AbstractNew optically active 1,1-disubstituted 2-vinylcyclopropanes ,3a, b were synthesized by esterification of the corresponding 1-ethoxycarbonyl-2-vinylcyclopropane- 1-carboxylic acid 2a,b with cholesterol and characterized by 1H NMR and IR spectroscopy. The liquid crystalline properties of the obtained monomers are reported. The effect of the structure of the 2-vinylcyclopropane monomers on the phase transition of the mesogen was investigated. Radical polymerization of the asymmetrically substituted monomers 3a,b in solution and in bulk resulted in liquidcrystalline polymers with 1,5-opened units, as evidenced by 1H NMR spectroscopy.

scholarly journals An Optically-Active Liquid-Crystalline Hexa-Adduct of [60]Fullerene which Displays Supramolecular Helical Organization.

ChemInform ◽  
2007 ◽  
Vol 38 (8) ◽  
Author(s):  
Stephane Campidelli ◽  
Torsten Brandmueller ◽  
Andreas Hirsch ◽  
Isabel M. Saez ◽  
John W. Goodby ◽  
...  
Keyword(s):  
Liquid Crystalline ◽  
Optically Active ◽  
Active Liquid
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