A number of codendrimers derived from chiral and achiral Schiff bases and poly(propyleneimines) (DAB) have been synthesized. The molecular structure and purity of these novel compounds has been verified by NMR spectroscopy, elemental analysis, and GPC. The phase behavior was studied by polarizing optical microscopy, differential scanning calorimetry, and X-ray diffraction techniques. It was found that all of these materials display a chiral smectic C mesophase over a wide temperature range. Although switching was observed for small concentrations of chiral compound when an electric field was applied, spontaneous polarization could not be measured in any of the codendrimers.
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Serrano et al. (2003) studied this question.
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