Journal ArticleDOI
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
TLDR
In this article, the phase transition behavior of polythioethers was investigated using differential scanning calorimetry, polarising optical microscopy and X-ray diffraction.Abstract:
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.read more
Citations
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Synthesis and mesomorphic properties of a series of dimers derived from thioether-terminated and cholesteryl
TL;DR: The synthesis and material properties of a series of new liquid crystalline compounds containing thioether and cholesteryl, these homologues with different alkyl chain lengths of 2-8, are reported in this paper.
Journal ArticleDOI
Regioselective Copolymerization of Epoxides and Phthalic Thioanhydride to Produce Isotacticity-Rich Semiaromatic Polythioesters
TL;DR: In this article , the Salcy-based Cr-complex with the modification of the steric hindrance around the catalytic center was applied to achieve the highly regioselective copolymerization of epoxides and PTA.
References
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Journal ArticleDOI
Liquid Crystalline Polymers
TL;DR: The concept of mesophase polymers was introduced by as discussed by the authors, where the chains are sufficiently rigid to remain mutually aligned in the liquid phase although the perfect positional periodicity of a crystal is no longer present.
BookDOI
Liquid-crystal polymers
TL;DR: In this paper, the authors present the statistical physics of Liquid Crystalline Ordering in Polymer Systems (A.R. Khokhlov, A.S.A. Tal'roze, N.N. Shibaev, and V.P.Shibaev).
Journal ArticleDOI
Functional polymers and sequential copolymers by phase transfer catalysis. XIX. Thermotropic polythioethers and copolythioethers based on 4,4′-dithiolbiphenyl†
Timothy D. Shaffer,Virgil Percec +1 more
TL;DR: In this paper, copolythioethers were synthesized from 4,4′-dithiolbiphenyl (TB) and α,ω-dibromoalkanes having between two and twelve methylene units.
Journal ArticleDOI
Functional polymers and sequential copolymers by phase-transfer catalysis. 15. Thermotropic copolyethers based on 4,4′-dihydroxybiphenyl, bisphenol a and 1,9-dibromononane
TL;DR: In this paper, the mesomorphic properties of copolymers containing as much as 70 mol % BPA have been analyzed using optical polarizing microscopy and DSC, and the influence of both copolymer composition and microstructural changes, including the nature of the chain ends, upon the mesomorph properties of these copolyethers have been discussed.
Journal ArticleDOI
Polyethers based on 4,4′-dihydroxyazoxybenzene: A new class of liquid crystalline main chain polymers
TL;DR: Preparation a partir du compose azoique et d'α,ω-dibromoalcanes, dans le nitrobenzene, par catalyse a transfert de phase, en presence de bromure de tetrabutylammonium as mentioned in this paper.