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Samples of liquid crystalline poly(ester-β-sulphide)s containing twin bis(p-oxybenzoate) units were studied by X-ray diffraction analysis as a function of temperature. The occurrence was observed of nematic (or cholesteric) and smectic phases, whose thermal stability and character strongly depended on the chemical structure of the repeating unit of the polymer.
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Angeloni et al. (1988) studied this question.
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