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Updated: Jun 20, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Published on: October 31, 2019

尾替代液晶烯二氧化物:合成和热otropic 特性

André Wicklein1, Andreas Lang, Mathis Muth

  • 1Department of Macromolecular Chemistry I, Applied Functional Polymers, Universität Bayreuth, 95440 Bayreuth, Germany.

Journal of the American Chemical Society
|September 22, 2009
PubMed
概括

研究人员用尾替代剂合成了新型烯二氧化物 (PBI) 染料. 引入橄乙烯甘乙烯 (OEG) 单元使热otropic 液晶行为成为可能,这对于电荷传输应用至关重要.

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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Disubstituted Cyclohexanes: cis-trans Isomerism

Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
In cyclohexane, the substituents can occupy different positions generating distinct isomers.