Two new homologous series of semiflexible main‐chain polyesters on the basis of 4‐hydroxy‐and 4‐carboxycinnamic acid in conjugation with 2‐tert‐butylhydroquinone and alkylene spacers with 3 to 8 methylene groups were prepared by low‐temperature solution condensation. The thermotropic properties were investigated by means of differential scanning calorimetry, polarising microscopy and X‐ray diffraction analysis. The differences in enantiotropic behaviour and thermal stability of the mesophases influenced by the two different linkage groups between alkylene spacer and rigid moiety are discussed in comparison to related systems known from the literature.
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Pörschke et al. (1994) studied this question.
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