Liquid crystallinity in polythioethers of 1,4-bis(mercaptomethyl)benzene (MB) and 4,4′-bis(mercaptomethyl)biphenyl (MBP) with α,ω-dibromo-n-alkanes and polythioesters of MB and MBP with n-alkanedioyl dichlorides

Polythioethers consisting of 1,4-bis(mercaptomethyl)benzene (MB) with α,ω-dibromo-n-alkanes (An, the number of methylene groups, n = 5-8) (MB-An) and 4,4′-bis(mercaptomethyl)biphenyl (MBP) with An (MBP-An), and polythioesters containing MB and MBP with n-alkanedioyl dichlorides (AMmC, the number of...

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Bibliographic Details
Published in:Liquid crystals 2008-06, Vol.35 (6), p.689-694
Main Authors: Isogai, Hideo, Tadano, Kenji, Yano, Shinichi
Format: Article
Language:English
Subjects:
liquid crystal polymers
polythioesters
polythioethers
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Summary:Polythioethers consisting of 1,4-bis(mercaptomethyl)benzene (MB) with α,ω-dibromo-n-alkanes (An, the number of methylene groups, n = 5-8) (MB-An) and 4,4′-bis(mercaptomethyl)biphenyl (MBP) with An (MBP-An), and polythioesters containing MB and MBP with n-alkanedioyl dichlorides (AMmC, the number of methylene groups, m = 5-8) (MB-AMmC and MBP-AMmC) were synthesised and their phase transition behaviour investigated using differential scanning calorimetry, polarising optical microscopy and X-ray diffraction. The MPB-An thioether polymers exhibited a nematic phase with good thermal stability but the MB-An thioether and MB-AMmC and MBP-AMmC thioester polymers exhibited no mesophase. The dependence of liquid crystalline behaviour on the chemical structure of the polymers is discussed.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290802080386