Abstract
The design, synthesis, and investigation of two series of side‐on dendrimers displaying nematic liquid crystal behavior at room temperature are described. The dendritic structures are derived from poly(amidoamine) (PAMAM‐(NH2)n) or poly(propylene imine) dendrimers (PPI‐(NH2)n) (with n = 4, 8, 16, 32, and 64) containing lateral attached mesogenic units in the periphery. The materials are characterized by 1H, 13C nuclear magnetic resonance (NMR) spectroscopy, matrix‐assisted laser desorption/ionization‐mass (MALDI‐TOF MS) spectrometry, differential scanning calorimetry (DSC), polarized optical microscopy (POM), and x‐ray diffraction spectroscopy. All dendrimers exhibit nematic mesophase behavior at room temperature. Conoscopic studies reveal that the nematic phase is uniaxial. The relationship between the structure of the two dendrimer series and the mesomorphic behavior is discussed. image
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