Helical Sense and Twisting Power in Thermotropic Side–Chain Copolymers

1990 ◽  
Vol 214 ◽  
Author(s):  
Sushil Krishnamurthy ◽  
Shaw H. Chen
Keyword(s):  
Molecular Interactions ◽  
Structural Similarity ◽  
Side Chain ◽  
Backbone Flexibility ◽  
Phenylethyl Alcohol ◽  
Chiral Nematic ◽  
Helical Twisting Power

ABSTRACTThermotropic chiral nematic copolymers containing (S)–(–)–1–phenylethyl alcohol and (R)–(–)–methyl mandelate with methacrylate backbone and those containing (S)–(–)–1–phenylethylamine and cholesterol with acrylate/methacrylate mixed backbone structures have been synthesized and characterized. It is found that the helical sense is dictated by chiral/nematic molecular interactions of a steric nature, and that the helical twisting power (HTP) is favored by the structural similarity between the chiral and nematic components. Furthermore, it is shown that HTP can be optimized with a suitable nematogenic comonomer by regulating the backbone flexibility within the acrylate/methacrylate series, which facilitates supramolecular arrangement without affecting the HTP.

scholarly journals Refinement of Protein Docking with Atom-Atom Contact Potentials, Backbone Flexibility and Side-Chain Repacking

2017 ◽  
Vol 112 (3) ◽  
pp. 54a
Author(s):  
Taras Dauzhenka ◽  
Ivan Anishchenko ◽  
Petras J. Kundrotas ◽  
Ilya A. Vakser
Keyword(s):  
Protein Docking ◽  
Side Chain ◽  
Backbone Flexibility

Light-Controllable Chiral Photochromic Multifunctional Liquid Crystal Polymers

2001 ◽  
Vol 709 ◽  
Author(s):  
Valery P. Shibaev ◽  
Alexey Yu. Bobrovsky ◽  
Natalia I. Boiko
Keyword(s):  
Liquid Crystalline ◽  
Spectral Gap ◽  
Optical Data ◽  
Side Chain ◽  
Liquid Crystal Polymers ◽  
Data Recording ◽  
Acrylic Polymers ◽  
New Family ◽  
And Storage ◽  
Helical Twisting Power

ABSTRACTA new family of light-controllable chiral photochromic multifunctional liquid crystalline (LC) side-chain acrylic polymers consisting of nematogenic, chiral and photochromic monomer units was obtained. The new principle of photoregulation of the helical supramolecular structure and optical properties of the binary and ternary chiral photochromic LC polymers based on the change of helical twisting power of the chiral photochromic monomer units was developed. The features of photooptical behaviour of LC polymers possessing the dual photochromism and the peculiarities of optical data recording based on the photochemical spectral gap burning were presented and discussed. The synthesized polymers are shown to be promising candidates for colour data recording and storage.

scholarly journals Thermotropic chiral nematic side-chain polymers and cyclic oligomers

1996 ◽  
Vol 21 (6) ◽  
pp. 1211-1233 ◽  
Author(s):  
Shaw H Chen ◽  
Hongqin Shi ◽  
John C Mastrangelo ◽  
Jane J Ou
Keyword(s):  
Side Chain ◽  
Chiral Nematic ◽  
Cyclic Oligomers

Dynamics of Defect Annihilation in Vitrified Liquid Crystalline (VLC) Thin Films Upon Thermal Annealing

1996 ◽  
Vol 425 ◽  
Author(s):  
H. Shi ◽  
D. Katsis ◽  
S. H. Chen ◽  
M. E. De Rosa ◽  
W. W. Adams ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Annealing ◽  
Liquid Crystalline ◽  
Structural Similarity ◽  
Annihilation Process ◽  
Chiral Nematic

AbstractBased on a series of model nematic and chiral-nematic compounds as well as a polymer analog, it was found that the annihilation of defects in a VLC system occurs at a much faster rate than its polymer analog. In chiral-nematic blends, the degree of structural similarity between the nematic host and the chiral dopant plays an important role; a wider biphasic region contributes to a slower annihilation process.

scholarly journals Degradation Potential of the Nonylphenol Monooxygenase of Sphingomonas sp. NP5 for Bisphenols and Their Structural Analogs

2020 ◽  
Vol 8 (2) ◽  
pp. 284 ◽  
Author(s):  
Masahiro Takeo ◽  
Junichi Akizuki ◽  
Aika Kawasaki ◽  
Seiji Negoro
Keyword(s):  
Substrate Specificity ◽  
Cell Suspension ◽  
Structural Similarity ◽  
Side Chain ◽  
Bisphenol S ◽  
Bisphenol F ◽  
Degrading Bacterium ◽  
Monooxygenase Gene ◽  
Wide Range ◽  
Endocrine Disrupting

The nonylphenol-degrading bacterium Sphingomonas sp. strain NP5 has a very unique monooxygenase that can attack a wide range of 4-alkylphenols with a branched side chain. Due to the structural similarity, it can also attack bisphenolic compounds, which are very important materials for the synthesis of plastics and resins, but many of them are known to or suspected to have endocrine disrupting effects to fish and animals. In this study, to clarify the substrate specificity of the enzyme (NmoA) for bisphenolic compounds, degradation tests using the cell suspension of Pseudomonas putida harboring the nonylphenol monooxygenase gene (nmoA) were conducted. The cell suspension degraded several bisphenols including bisphenol F, bisphenol S, 4,4′-dihydroxybenzophenone, 4,4′-dihydroxydiphenylether, and 4,4′-thiodiphenol, indicating that this monooxygenase has a broad substrate specificity for compounds with a bisphenolic structure.

scholarly journals A Simple Model of Backbone Flexibility Improves Modeling of Side-chain Conformational Variability

2008 ◽  
Vol 380 (4) ◽  
pp. 757-774 ◽  
Author(s):  
Gregory D. Friedland ◽  
Anthony J. Linares ◽  
Colin A. Smith ◽  
Tanja Kortemme
Keyword(s):  
Simple Model ◽  
Side Chain ◽  
Backbone Flexibility ◽  
Conformational Variability

Precisely Tuning Helical Twisting Power via Photoisomerization Kinetics of Dopants in Chiral Nematic Liquid Crystals

Langmuir ◽  
2018 ◽  
Vol 34 (2) ◽  
pp. 700-708 ◽  
Author(s):  
Dongxu Zhao ◽  
Yuan Qiu ◽  
Weinan Cheng ◽  
Shuguang Bi ◽  
Hong Wang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Nematic Liquid Crystals ◽  
Chiral Nematic ◽  
Kinetics Of ◽  
Helical Twisting Power
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