Abstract
The mesomorphic behavior of several new end-functionalized liquid-crystal-containing dendrimers is reported. These liquid-crystalline dendrimers are obtained by attaching promesogenic units to the termini of the preexisting first five generations of poly(amidoamine) (PAMAM) and poly(propyleneimine) (DAB) polymers by a condensation reaction; the promesogenic units are derived from salilcylaldimine bearing one, two, or three terminal aliphatic chains. All of the compounds were found to exhibit liquid-crystalline properties, as deduced by polarized-light optical microscopy (POM) observations, differential scanning calorimetry (DSC) measurements, and X-ray diffraction (XRD) studies. The nature of the liquid-crystalline behavior of the dendrimers is directly correlated with the number of terminal chains grafted on the peripheral anisotropic groups. Indeed, the presence of one chain per mesogenic unit favors their parallel arrangement; hence, smectic mesomorphism (SmA and SmC) is induced. Increasing the number ...
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