Abstract
AbstractThermosetting cholesteric oligocarbonates were prepared by polycondensation of mesogenic diphenols such as 4,4′‐dihydroxybiphenyl (DHB) or hydroquinone 4‐hydroxy‐benzoate (HQHB; system. name: 4‐hydroxyphenyl 4‐hydroxybenzoate) with methylhy‐droquinone and isosorbide. Trichloromethyl chloroformate served as condensing agent and propargyl alcohol (system. name of propargyl: 2‐propynyl), 4‐propargyloxybenzoyl chloride or 6‐propargyloxy‐2‐napthoyl chloride served as chain stoppers. Most oligocar‐bonates form a cholesteric phase over a broad temperature range. Depending on the mole fraction of isosorbide these oligocarbonates form Grandjean textures when sheared in the molten state.
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