Abstract
A series of fourteen liquid crystalline monomers and polyoxetanes containing trans-biphenyl side group have been successfully synthesized. The thermal and mesomorphic properties of monomers (1M~14M) and polymers (1P~14P) are measured using DSC, POM, and X-ray. All of the series monomers present enantiotropic smectic H and smectic G phase and the series polymers show enantiotropic smectic A phase which three polymers contained exhibit smectic E. Polyoxetanes have been used as a cationic ring-opening polymerization of oxetane monomers bearing a pendant trans-stilbene mesogenic unit including different spacer length and terminal alkyl length.
Highlights
The first thermotropic side-chain liquid crystalline polymers were synthesized by Finkelmann and Rehage [1,2]
The purpose of this research is to show the synthesis of a new series of side-chain liquid crystalline polyoxetanes containing the trans-stilbene mesogenic side group
Differential scanning calorimeter (DSC) was recorded on a Seiko SSC/5200 (Seiko, New Castle, DE, USA) with determined compounds of thermal transitions and thermodynamic parameters equipped with a cooling accessory
Summary
The first thermotropic side-chain liquid crystalline polymers were synthesized by Finkelmann and Rehage [1,2]. They had already understood the main factors in the formation of the liquid crystal phase of compounds. The side-chain liquid crystal polymer integrated the properties of the liquid crystal and the polymer properties. In the past few decades, a large number of side-chain liquid crystal polymers had been synthesized [8–10]. They combined the many different backbone types (such as methacrylates, acrylates, siloxanes, epoxides, ethylenes, etc.) and the vast number of mesogenic units available
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