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Alkyloxy-substituted liquid-crystalline aromatic copolyesters

3.Synthesis and properties of main chain copolyesters derived from 2,5-bis-(pentyloxy)-terephthaloyl dichloride and aromatic diols

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Summary

The synthesis and characterization of main chain liquid crystalline polyesters arising from 2,5-bispentyloxy substituted terephthalic aicd (3) and aromotic diols are described. 3 was prepared from diethyl 2,5-dihydroxyterephthalate and 1-bromopentane. The polyesters were prepared from 4,4′-dihydroxybiphenyl (5), hydroquinone (6), 2,5-dimethyl hydroquinone (8) and the substituted terephthaloyl dichloride (4) in 1,1,2,2-terachloroethane. Their structures were characterized by 1H-NMR, GPC and elemental analyses; their thermal behavior was studied by DSC measurements, microscopy under polarized light, and thermogravimetric analyses. The melting points are in the range of 130–280°C. All of them except of those with a high amount of 2,5-dimethyl hydroquinone (8) form a nematic phase above their melting point.

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Authors and Affiliations

  1. Institut für Organische Chemie der Freien Universität Berlin, Takustrasse 3, D-14195, Berlin, Germany

    Gerhard Ko\mehl & Bettina Lundt

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  1. Gerhard Ko\mehl
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  2. Bettina Lundt
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Ko\mehl, G., Lundt, B. Alkyloxy-substituted liquid-crystalline aromatic copolyesters. Polymer Bulletin 33, 497–504 (1994). https://doi.org/10.1007/BF00296156

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  • DOI: https://doi.org/10.1007/BF00296156

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