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Ionic end‐capping of (semi)telechelic polymers by mesogens
Author(s) -
Gohy JeanFrançois,
Sobry Roger,
Van den Bossche Guy,
Jérôme Robert
Publication year - 2000
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/1097-0126(200011)49:11<1293::aid-pi475>3.0.co;2-z
Subject(s) - mesogen , polymer chemistry , polymer , small angle x ray scattering , telechelic polymer , ionic bonding , counterion , differential scanning calorimetry , materials science , fourier transform infrared spectroscopy , end group , infrared spectroscopy , chemistry , chemical engineering , organic chemistry , copolymer , scattering , ion , liquid crystalline , physics , optics , thermodynamics , engineering
Two methods have been used to end‐cap linear polymer chains at one end or at both ends by a mesogen through ionic bonding. These polymers are designated as liquid‐crystalline halato(semi)telechelic polymers (LC H(S)TPs). The first method relies on the ion exchange reaction between the metal counterion of halato(semi)telechelic polymers and an ionic mesogen. The second method is based on the proton transfer from a sulfonic or carboxylic acid end‐group to a tertiary aliphatic amine, this approach being controlled by the relative p K a values of the acidic and basic groups. If the p K a difference is not large enough, strong hydrogen‐bonding is observed by Fourier‐transform infrared (FTIR) spectroscopy rather than proton transfer. The resulting materials have been characterized by differential scanning calorimetry (DSC), polarized optical microscopy (POM) and small‐angle X‐ray scattering (SAXS). © 2000 Society of Chemical Industry