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Supramolecular Thermotropic Liquid Crystalline Materials with Nematic Mesophase Based on Methylated Hyperbranched Polyethylenimine and Mesogenic Carboxylic Acid
Author(s) -
Chen Yu,
Shen Zhong,
Gehringer Lionel,
Frey Holger,
Stiriba SalahEddine
Publication year - 2006
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200500628
Subject(s) - mesogen , thermotropic crystal , mesophase , supramolecular chemistry , liquid crystal , materials science , polymer chemistry , differential scanning calorimetry , crystallography , chemistry , liquid crystalline , crystal structure , physics , optoelectronics , thermodynamics
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.