Ultraviolet stability of liquid crystals containing cyano and isothiocyanato terminal groups

    Authors

    C. H. Wen; S. Gauza;S. T. Wu

    Comments

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    Abbreviated Journal Title

    Liq. Cryst.

    Keywords

    BIREFRINGENCE; DISPERSIONS; MIXTURES; DISPLAYS; PHASE; Chemistry, Multidisciplinary; Crystallography; Materials Science, ; Multidisciplinary

    Abstract

    The ultraviolet (UV) stabilities of liquid crystal compounds containing cyano (CN) and isothiocyanato (NCS) terminal groups are compared. UV exposure is found to degrade the clearing temperature, birefringence, dielectric constants and visco-elastic coefficient of the liquid crystal compounds. The measured data show that the NCS molecular structure exhibits a better UV stability than do the corresponding CN structures. Lewis resonance structures are used to explain this phenomenon.

    Journal Title

    Liquid Crystals

    Volume

    31

    Issue/Number

    11

    Publication Date

    1-1-2004

    Document Type

    Article

    Language

    English

    First Page

    1479

    Last Page

    1485

    WOS Identifier

    WOS:000225105800007

    ISSN

    0267-8292

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