Morphology of thermotropic polyesters with azoxybenzene moiety examined by optical microscopy.
نویسندگان
چکیده
منابع مشابه
Effect of Annealing on Morphology of Thermotropic Liquid Crystalline Polyesters
Liquid crystal polymers with semiflexible polymer backbone exhibit crystalline order despite of some defects in crystal packing. Isothermal heat treatment of the polymers below and above their liquid crystalline temperatures is expected to provide the necessary energy and time for the molecular chains to overcome the defects in crystal packing and to be arranged in a more perfect crystal lattic...
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Properties of linear polyesters based on azoxybenzene and 2,2'-methylazoxybenzene moieties with linear, flexible spacers based on mixtures of dodecanedioic acid (DDA) and methyladipic acid (MAA), chiral or racemic, of various compositions (system MAA/DDA-8 and MAA/DDA-9, respectively) have been described. Substitution of methyl groups in the 2,2' or 3,3' positions of the mesogenic core Ieads to...
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15 صفحه اولPhospholipids with a stimuli-responsive thermotropic liquid-crystalline moiety.
Lyotropic liquid-crystalline phospholipids having an electro- and/or light-responsive mesogenic core were prepared. These LCs show lyotropic smectic A, smectic C, rectangular columnar, and nematic phases. We succeeded in the dynamic control of these LC phases by applying an electric field, which could lead to electrically switchable phospholipid bilayers.
متن کاملStilbene-containing Thermotropic Liquid Crystalline Polyesters for Aerospace Applications
Materials used in space travel must maintain thermal and dimensional stability in extreme conditions, while remaining melt processable for ease of industrial production. The rigid chemical structure of stilbene often correlates to polymers exhibiting a liquid crystalline morphology and the olefinic bond undergoes a [2 + 2] cycloaddition in the presence of UV light. Based on the combined benefit...
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ژورنال
عنوان ژورنال: Sen'i Gakkaishi
سال: 1991
ISSN: 0037-9875,1884-2259
DOI: 10.2115/fiber.47.8_392