Abstract
Two series of polyetherurethanes (PEU) were prepared from poly(tetramethylene oxide) (PTMO, M n = 1000) as a soft segment and varying concentrations of hard segments based on 1 ,6-diisocyanohexane (HDI), and 2,2'-methyliminodiethanol (MDEA). The liquid-crystalline PEU cationomers (LC-PEUCs) were synthesized by quaternization of the tertiary amine of MDEA using liquid-crystalline mesogenic quaternizing agents (LCMQAs). The LCMQAs consisting of a rigid mesogenic azobenzene moiety and biphenyl attached to alkyl bromide as a spacer were synthesized. The quaternization and molecular structure of LC-PEUCs were ascertained by FT-IR and 'H-NMR spectroscopy. The effects of LCMQAs and degree of quaternization on the liquid-crystalline behavior, the extent of phase separation. and physical properties were studied by differential scanning calorimetry (DSC), a polarizing microscope equipped with a heating stage, dynamic mechanical analysis (DMA), and tensile testing. All of the LCMQAs exhibited a nematic phase and a smectic mesophase was found for all synthesized LC-PEUCs.
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