NOVEL GLASS-FORMING ORGANIC MATERIALS .3. CUBANE WITH PENDANT NEMATOGENS, CARBAZOLE, AND DISPERSE RED-1

Mesogenic and nonmesogenic functional moieties were attached as pendan t groups to the cubane core for an investigation of the glass-forming ability and morphological stability of the hybrid systems. Nematogens and carbazole were found to yield hybrid systems that are nematic and isotropic, respectively, all capable of vitrification with above-ambie nt glass transition temperatures (T(g)s). Moreover, DR1 was found to y ield a hybrid system possessing S-A mesomorphism upon thermal processi ng under kinetically controlled conditions; it was further demonstrate d that S-A glass could be obtained with a T-g of 95 degrees C. On the other hand, crystals were obtained with thermal processing under therm odynamically controlled conditions. Of the five model compounds based on cubane, it appears that the lower the melting or clearing temperatu re of the pendant group, the more morphologically stable the hybrid sy stem. It was also found that adamantane-based systems possess about th e same T-g with a superior morphological stability in comparison to th e cubane-based counterparts.