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- W2078207295 abstract "Abstract The monomer N-(p-methacryloyloxy-benzylidene)-p-aminobenzoic acid (MOBAB) has been extensively investigated. Several crystallization methods were developed in order to obtain it in a pure state. MOBAB showed a complicated thermal behaviour depending on the purification procedure, drying and ageing. Crystallization from p-dioxane or mixtures with THF led to monoclinic needle-like crystals that contained one molecule of dioxane to two molecules of MOBAB, as confirmed from X-ray examination. From combined DSC, WAXS and microscopic results, the various thermal transitions in °C (excluding those arising from solvents) could be assigned to polymerization. The interconversion between the K1 and K2 crystal forms may be caused by the existence of two conformers of the aromatic azomethine moiety, as supported by a conformational analysis and literature data. Radical polymerization of MOBAB in DMF showed classical features and led to low molar mass polymers with Tg of about 130°C. The polymers showed some ordering, possibly arrising from frozen-in nematic structures. Solutions in DMF showed a polyelectrolyte effect." @default.
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- W2078207295 date "1992-10-01" @default.
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- W2078207295 title "The liquid-crystalline monomer n-(p-methacryloyloxy-benzylidene)-p-aminobenzoic acid: its synthesis, characterization and polymerization" @default.
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- W2078207295 doi "https://doi.org/10.1016/0014-3057(92)90206-h" @default.
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