Liquid crystalline cyclic tetramethyltetrasiloxanes containing coumarin moieties

Yanqing Tian, Eiichi Akiyama, Yu Nagase

    Research output: Contribution to journalArticlepeer-review

    34 Scopus citations

    Abstract

    A series of new cyclic tetramethyltetrasiloxanes with coumarin units were synthesized. By a comparative study with their related vinyl terminated precursors, the liquid crystalline properties of the cyclic tetramethyltetrasiloxanes were investigated. The results show that the thermal properties of the cyclic tetramethyltetrasiloxanes are stabilised through their increasing clearing temperatures and broadening mesophases. The thermal properties of the cyclic tetramethyltetrasiloxanes show that introduction of a tail group at the 3 position of the coumarin unit increases the thermal stability of the liquid crystalline order. Increasing the length of the tail group causes the clearing temperatures of the cyclic tetramethyltetrasiloxanes to decrease. The photochemical behavior of spin-coated films of the cyclic tetramethyltetrasiloxanes indicates the photo-crosslinking of the coumarin units in the thin films.

    Original languageEnglish (US)
    Pages (from-to)1253-1258
    Number of pages6
    JournalJournal of Materials Chemistry
    Volume13
    Issue number6
    DOIs
    StatePublished - Jun 1 2003

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Chemistry

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