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Dielectric behaviour of a side-chain-bearing liquid-crystalline polysiloxane

A thermally stimulated depolarization current study

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Abstract

The relaxation of electric field-induced polar orientation in a side-chain-bearing liquid-crystalline polysiloxane was measured by means of thermally stimulated depolarization currents. Different relaxation mechanisms were identified and characterized: the glass transition cooperative relaxation exhibits compensation behaviour. On the other hand, lowerT g and upperT g discharges were observed and their molecular nature is discussed.

Zusammenfassung

Mittels thermisch stimulierter Depolarisierungsströme wurde die Relaxation der durch elektrische Felder induzierten polaren Ausrichtung in flüssigkristallinen Polysiloxanen mit Seitenketten gemessen. Es konnten verschiedene Relaxationsmechanismen gefunden und beschrieben werden: die mit der Glasumwandlung verbundene Relaxation zeigt Kompensationsverhalten. Andererseits wurden untereT g und obereT g Entladungen beobachtet und deren molekulare Natur diskutiert.

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Authors and Affiliations

  1. Centro de Química, Física Molecular, Complexo I, IST, Av. Rovisco Pais, 1096, Lisboa Codex, Portugal

    J. F. Mano & J. J. Moura-Ramos

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  1. J. F. Mano
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  2. J. J. Moura-Ramos
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Mano, J.F., Moura-Ramos, J.J. Dielectric behaviour of a side-chain-bearing liquid-crystalline polysiloxane. Journal of Thermal Analysis 44, 1037–1046 (1995). https://doi.org/10.1007/BF02547531

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  • DOI: https://doi.org/10.1007/BF02547531

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