Please use this identifier to cite or link to this item: https://doi.org/10.1080/02678290210126040
Title: Effect of electron donor-acceptor interaction on the thermal stability of supramolecular side chain liquid crystalline polymers based on poly(3-carboxypropylmethylsiloxane)
Authors: Li, X.
Goh, S.H. 
Lai, Y.H. 
Issue Date: 2002
Source: Li, X., Goh, S.H., Lai, Y.H. (2002). Effect of electron donor-acceptor interaction on the thermal stability of supramolecular side chain liquid crystalline polymers based on poly(3-carboxypropylmethylsiloxane). Liquid Crystals 29 (5) : 675-685. ScholarBank@NUS Repository. https://doi.org/10.1080/02678290210126040
Abstract: Supramolecular side chain liquid crystalline polymers were prepared from poly(3-carboxy-propylmethylsiloxane) (PSI100) and azobenzene-based derivatives through intermolecular hydrogen bonding between the carboxylic acid groups of PSI100 and the imidazole rings in the azobenzene-based derivatives. The presence of H-bonding was confirmed using FTIR spectroscopy. The polymeric complexes behave as liquid crystalline polymers and exhibit nematic mesophases identified on the basis of the observation of Schlieren textures. The mesogenic behaviour of these complexes was studied by polarizing optical microscopy and X-ray diffraction. The thermal behaviour of the complexes was investigated by differential scanning calorimetry. On increasing the spacer length, the transition temperatures initially increase. A further increase in spacer length, however, leads to a decrease in the transition temperatures. The electron donor-acceptor interaction between unlike mesogenic units in supramolecular copolymeric complexes helps to stabilize the mesophase.
Source Title: Liquid Crystals
URI: http://scholarbank.nus.edu.sg/handle/10635/76014
ISSN: 02678292
DOI: 10.1080/02678290210126040
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