Synthesis and Mesomorphic Properties of a Series of Cholesteric Liquid Crystals
A series of cholesterol liquid crystal compounds was synthesized. Phase-transition temperatures and mesomorphic textures of these synthesized compounds were characterized with differential scanning calorimetry and polarized optical microscopy, respectively. In these molecules the terminal ester chains CnH2n-1COO-, where n was the number of carbon atoms in the terminal ester chains, were linked to the cholesterol core. All of the synthesized cholesterol compounds exhibited mesophases for the first heating. However, as temperature decreased from their clearing points, their micrographs can also be divided into two categories, the first category exhibits branch-like mesophase textures for n in the range of 1-10 while the second category exhibits branch-like crystal textures for n in the range of 11-18.
Yuan Ming Huang
Q. L. Ma and Y. M. Huang, "Synthesis and Mesomorphic Properties of a Series of Cholesteric Liquid Crystals", Materials Science Forum, Vols. 663-665, pp. 759-762, 2011