Abstract
Abstract Upon ionic complexation of tris(2-aminoethyl)amine and di- or trialkoxybenzoic acids with normal and branched chains, hexagonal columnar mesophases were generated. The two parameters, the length and the cross-sectional area of the alkyl chains, were investigated to unveil the volume effect of the alkyl chains on the formation and stabilization of the columnar mesophases. The thermal stabilities of the columnar phases were strongly depended on the molar ratio of the acids to the amine. The highest clearing temperature (the most stable mesophase) was obtained at a ratio specific to the alkyl chain volume, not necessarily stoichiometric. We estimated the packing fraction (Vcomp⁄Vcell) on the basis of the volume of the ionic complexes at these particular ratios (Vcomp) and that of the unit cell of the Colhex phases (Vcell). The most suitable packing fractions for the Colhex phases of the present ammonium carboxylates were estimated to be in a range of 0.63–0.66.
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