Poly(azine‐ether)s (1a and 1b) derived from 2,4‐dihydroxybenzaldehyde and 2,4‐dihydroxyacetophenone, respectively, were synthesized by condensation of the corresponding dicarbonyl monomer (2a or 2b) containing 10 methylene units with hydrazine hydrate. For the preparation of 1a ethanol or acetonitrile were found to be the best solvents, DMF or 1,4‐dioxane for the preparation of 1b. The liquid‐crystalline behaviour of the polymers was studied by DSC and on the hot stage of a polarizing microscope. All of them formed nematic mesophases in melts.
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Marcos et al. (1989) studied this question.
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