Supramolecular Thermotropic Liquid Crystalline Materials with Nematic Mesophase Based on Methylated Hyperbranched Polyethylenimine and Mesogenic Carboxylic Acid
✍ Scribed by Yu Chen; Zhong Shen; Lionel Gehringer; Holger Frey; Salah-Eddine Stiriba
- Book ID
- 102490574
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 151 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: Supramolecular interaction of fully methylated hyperbranched polyethylenimines (PEI) with a mesogen‐based carboxylic acid, 5‐(p‐cyanobiphenoxy)pentanoic acid, results in the formation of supramolecular complexes exhibiting thermotropic liquid crystalline (LC) mesophases. In contrast to the common smectic mesophases of most dendritic LC polymers, nematic LC phases were observed. The complexation of PEI and the mesogen units is due to electrostatic interaction between the carboxylate groups and the ammonium end groups of PEI. LC properties were investigated by a combination of differential scanning calorimetry, polarizing light optical microscopy, and X‐ray diffractometry.
Schematic illustration of the supramolecular assembly of CBPA with PEIMe backbone.
magnified imageSchematic illustration of the supramolecular assembly of CBPA with PEIMe backbone.