Fully aromatic and aromatic‐aliphatic polyformamidines were prepared by high‐temperature solution polycondensation of the appropriate diamines with triethyl orthoformate (TEOF). Copolyformamidines of benzidine (4,4′‐biphenyldiamine) with p‐phenylene and trans‐1,4‐cyclohexylene units, respectively, showed liquid‐crystalline behaviour. Both series of copolyformamidines differ distinctly in crystallinity. This has been discussed with respect to sequence distribution, which was determined by 13 C NMR spectroscopy.
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Rillich et al. (1995) studied this question.
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