Conformational energies of para‐aromatic and aryl‐aliphatic polyamides: Relation to mesogenic character in solution

PCILO conformational calculations have been carried out on several model compounds of aromatic polyamide oxamides and polyamide hydrazides. The comparison of the entropy of the equilibrium conformations allows a classification of the various constitutive units into “rigid” segments, and “flexible” ones having respectively low or high entropies. From the results, it is possible to predict the mesogenic nature of solutions of a large number of aromatic polyamides, polyamide hydrazides, and polyamide oxamides.